WOW !!! Thanks a lot @mitu !! ;-)

This KROM X-Box usb gamepad is new, and I didn't know what you meant with X-Input or D-Input.
So I read in the manual and understood.
The problem was because when we just connect the gamepad on the RaspBerry Pi 4 (RetroPie) by default it always starts in X-input mode (PC X-Box) and to change to Direct-input mode we just have to press and hold the home button for about 5 seconds.
Then RetroPie recognized the control normally and it was possible to configure it.

Thank you so much!!!

@mitu Thanks to another thread of yours I have found the solution.
https://retropie.org.uk/forum/topic/17492/retropie-4-4-and-tronsmart-mars-g02-with-wireless-dongle-problem

The issue was that the controller by default comes recognized as a X mode (Xbox), I had to change it to D-mode (Android) by pressing 5 seconds the button home. After that joydev inmediately recognized it as Sharwan model.

Once again, thaks a lot for your help.