If you have muxless gpu then its impossible to use it in android. see below diagram. You will have to use your igpu for now
Muxless GPUs don't have output and it connect to iGPU through a PCI link
Just like how you plug your GPU into the motherboard
If you don't plug your screen/hdmi into the discrete GPU but plug in mainboard it will use iGPU
Muxless is an absolute nightmare in both Linux and Windows. In Windows it takes tons of tweaking to get a lot of programs and games to recognize the discrete card. Even when it does recognize it, lots of features still don't work properly (like DX11/12 support in some game) On Linux, it is literally impossible to use the discrete card AT ALL, and even graphically weak games like Hedgewars won't run because the integrated card has issues with OpenGL.
Old kernel modesetting wont work (amdgpu.modeset=1 i915.modeset=0 or nouveau.modeset=1 i915.modeset=0) instead you get swift shader, with poor graphic if you try them.
I tried various things on the exact same gpu you guys have using a member in our discord server as a test subject (he also have radeon 530) but up to this day nothing worked. tried blacklisting i915, modesetting, logcat,dmesg, debug mode and initrd.img patching, nothing works.These days only high end workstation laptops have muxed gpu instead of muxless. Or ancient laptops more than 5-6 years old.