Pico8 and game cartridges on Onion?

I’ve just discovered the truly awesome range of games offered for fantasy consoles on itch.io and I would love to play some of them on the Miyoo Mini. OnionOS seems to be able to emulate Pico8, but can anyone tell me what the methodology is?

I imagine that one would need the .PNG cartridges, but these are not always distributed, only binaries.

How does the Pico8 ecosystem work on Miyoo Mini?