The bottom line is that I use r9mm, for this, yaapu script is installed on taranis x7. For this bundle to work, I solder the wire to tx uart 2 and solder to r9mm. In serial 2 I set protocol 10 and there is an item in the developer firmware (4.0 dev) in setting up the show option! I choose option 7. And then telemetry works, very well with a small delay.
And the question is how to do the same but in stable firmware, because there is no option there.