How to make syntax highlighting and line numbers in the textArea of ​​an application written in Qt (c++)?

Question

Qt

How to make syntax highlighting and line numbers in the textArea of ​​an application written in Qt (c++) for the c++ code editor. I think the answer should be simple, but I'm dumb

Answer 1

By hand, by hand.
See an example:
https://evileg.com/en/post/218/
I'm sure you can google ready-made colorings of certain service words.