Intel HD 3000 kext for Catalina 10.15.6 Latest 09.20. This kext installer, based Chris1111 patch, and I just modified to use 2GB VRAM in Mac OS High SIerra and later. Tested till Catalina latest. Note that VRAM can be used upon BIOS or firmware is 512MB, so the 1.5GB addition VRAM is tak from your physical RAM cut.
Get this file on : https://github.com/ipang-dwi/efi-catalina/releases/tag/09.20