Как покрасить разные буквы надписи QLabel в разные цвета PyQt5

Пишу приложение, измеряющее вашу скорость печати.

Столкнулся с проблемой: не могу выделять правильно написанные буквы зеленым цветом, а ошибочно написанные красным.

Как я могу в одной надписи текст писать двумя разными цветами?
(Желательно, чтобы это работало с помощью индексов)

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
import sys, random, time
from PyQt5.Qt import *
from PyQt5 import QtWidgets
from PyQt5.QtTest import *

class Window(QWidget):
    def __init__(self, parent = None):
        QWidget.__init__(self, parent)


        self.text_for_typing = QLabel(self)
        self.text_for_typing.setGeometry(140,100,320,150)
        self.text_for_typing.setStyleSheet("background-color: rgb(255, 255, 127); \
                                            font: 87 14pt Segoe UI Black;")
        self.text_for_typing.setWordWrap(True)

        self.time = QLabel(self)
        self.time.setGeometry(120,400,100,25)
        self.time.setStyleSheet("font: 18pt Snap ITC;")

        self.button_generate_symbols = QPushButton(self)
        self.button_generate_symbols.setGeometry(20, 145, 90, 30)
        self.button_generate_symbols.setText("Generate")
        self.button_generate_symbols.setStyleSheet("background-color: rgb(85, 85, 127); \
                                                          font: 87 11pt Segoe UI Black;")

        self.button_start = QPushButton(self)
        self.button_start.setGeometry(490, 100, 90, 30)
        self.button_start.setText("Start")
        self.button_start.setStyleSheet("background-color: rgb(85, 85, 127); \
                                                                  font: 87 11pt Segoe UI Black;")

        self.letters = "абвгдежзиклмнопрстуфхцчшщйэюя "
        self.numbers = "0123456789"

        self.area_for_typing = QTextEdit(self)
        self.area_for_typing.setGeometry(140,280,320,50)
        self.area_for_typing.setStyleSheet("font: 87 11pt Segoe UI Black;")



        self.button_text_or_numbers = QPushButton(self)
        self.button_text_or_numbers.setGeometry(20,100,90,30)
        self.button_text_or_numbers.setText("Text")
        self.button_text_or_numbers.setStyleSheet("background-color: rgb(85, 85, 127); \
                                                  font: 87 11pt Segoe UI Black;")

        self.main_name = QLabel(self)
        self.main_name.setGeometry(140,30,320,50)
        self.main_name.setText("TypingSpeed")
        self.main_name.setStyleSheet("font: 36pt Algerian;")

        self.setStyleSheet("background-color: rgb(170, 170, 255);")
        self.setWindowTitle("TypingSpeed")
        self.setWindowIcon(QIcon("keyboard.ico"))
        self.resize(600,450)
        self.setFixedSize(self.size())

        self.show()

    def action(self):

        self.button_text_or_numbers.clicked.connect(self.change_text_or_numbers)
        self.button_generate_symbols.clicked.connect(self.generate_symbols)
        self.button_start.clicked.connect(self.start)

    def change_text_or_numbers(self):
        if self.button_text_or_numbers.text() == "Text":
            self.button_text_or_numbers.setText("Numbers")
            self.text_for_typing.setText("")
        else:
            self.button_text_or_numbers.setText("Text")
            self.text_for_typing.setText("")

    def generate_symbols(self):
        text_for_typing = ""

        if self.button_text_or_numbers.text() == "Text":
            strings = []

            file = open("ENRUS.TXT")
            file.seek(0)

            for line in file:
                if line[0] in self.letters and line[0:-1] not in self.numbers:
                    strings.append(line)

            for i in range(6):
                random_int = random.randint(0,100)
                word = strings[random_int]
                text_for_typing+= word + " "

            self.text_for_typing.setText(f"<center>{text_for_typing}</center>")

        else:
            for i in range(20):
                number = ""

                for j in range(4):
                    number+=self.numbers[random.randint(0,len(self.numbers)-1)]

                text_for_typing += number + " "

            self.text_for_typing.setText(f"<center>{text_for_typing}</center>")

    def start(self):
        if self.text_for_typing.text() != "":
            seconds = [3, 2, 1]
            self.button_text_or_numbers.setEnabled(False)
            self.button_generate_symbols.setEnabled(False)
            self.button_start.setStyleSheet("background-color: rgb(255,85,0); \
                                             font: 87 11pt Segoe UI Black;")
            
            for i in range(3):
                self.button_start.setEnabled(False)
                self.button_start.setText(f"{seconds[i]}")
                qApp.processEvents()
                time.sleep(1)
                
            self.button_start.setEnabled(True)
            self.button_start.setText("Finish")
            seconds = 0
            
            while True:
                if self.text_for_typing.text()[8:len(self.area_for_typing.toPlainText())+8] == self.area_for_typing.toPlainText():
                    self.text_for_typing.setStyle() #Вот здесь буду пытаться красить правильные буквы (8: И +8, т.к. <center> в self.text_for_typing
                    
                QTest.qWait(1000)
                seconds+=1
                self.time.setText(f"{seconds}s")


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = Window()
    window.action()
    sys.exit(app.exec_())