Hi @VRHA,
the Virtual Input shot show up in Home Assistant. Do you see the Input in the loxone App on your Phone.
The Input or any sensor must be enabled for the app. Otherwise it is not visible for any App or program.
When you have the sensor in home-assistant you can try to change the value from home-assistant or make a automation. But I never tried it like that. I can implement it if it is not working. It should no big deal.
I use most of the time nodred with the loxone binding to set values on the loxone.