@ferdinand many thanks, I think that the topic is closed! You're amazing!

@ferdinand Thank you very much for your answer, I am insanely grateful!
Unfortunately, I couldn't attach the code, because I didn't get any result, that is, literally I have nothing to attach. According to which solution you gave me, it is almost perfect, it does everything you need, except that it has some background around it, and I needed only text. This is really my first time trying to work with python and solve a similar problem, sorry if it's hard with me.
Thank you again!

I tried to create something similar to annotation tag, but so that it had neither color nor bubble - only text. But all attempts and efforts are unsuccessful. Can you tell me the way to solve the problem?

I need a text that will be attached to the object, look at the camera all the time and regardless of the camera position it should be the same size.
(This is how Google maps signatures work - house numbers, street names, for example)
Yes, this can be implemented using xpresso and look at camera tag, but when I work with it, the viewport does not draw everything in real time, I need a mouse click in the graph with objects, and I need everything to happen in realtime.

Thank you in advance!