Hey @alexxs ,
While these threads are not relevant to your original questions, one could show you how to change the overlays, the other will show you how to change variables in uboot,
Controlling the peripheral in IMX8 with M4 core - #21 by hfranco.tx → uboot
10.1 inch capacitive touch screen not functional → overlays
I hope this is useful till the official support replies
Best,
AM