For enyone comming after. I got my hands on a drawcia x360 11 G4 chromebook a few months ago. managed to put full UEFI rom firmware thanks to instructions on this forum and instructions on mrchromebox.tech. (huge thanks btw).
Been trying to figure out how to use the touch every now and then screen since i was sure it worked in ChromeOS before flashing the device.
Turned out its just as simple as activating the GTCH7503 option in the boot options for touchscreen type input, and now it just works for me, i have not tried really to do anything else on this install, running EndeavourOS Linux but tried also on Manjaro boot disk.
TLDR: In boot menu option for “Touchscreen Type” - use GTCH7503 option.