I have released a stand-alone miner than can be used on Android phones. One user has successfully gotten it to run on his Pixel 5, and there are instructions in the README:

https://github.com/leviable/noso-go

This new miner supports Windows, Linux and MacOS, as well as i386, x86_64, ARM and ARM64 processors. Confirmed to run on desktops, laptops, cloud VMs, Raspberry Pi 4, and at least one Android phone.

Hashing speeds are 3 to 5 times greater than from default GUI miner.

Do note that running mining software at 100% on all cores of your phone maybe not be good for the health of your phone. Use with caution.