Please add an ANDROID runner
I think that the QEMU based Android SDK emulator - or something better - can run Android games in portrait mode to enjoy them in desktop computers and TV sets.
Something as it is being done in MS WOS with qemu or virtualbox by proprietary software.
I have not the skills to implement that runner, but I think it would be easy to do with any AOSP - Android Open Software Project - ROM, Lineage based use to be good, and Gapps, and or other apk stores to be able to install games from them.
Games as Roblox, that still do not run on Lignux wine / proton, will run under Android emulation.
Of course Anbox - Android X86 LXC - is also a solution if it would work well, but it does not work in every distribution. - It is a snap, and flatpak, as for Retroarch, are far better (real tree reading mounted devices with the flatpak version and not with the snap one) - . But if it works it would be also a great option.
Thanks in advance for your work.