So i lokked a bit more and the sixel support seems to be decently good in foot (and i need something that works in tmux)
you can even play doom or videos at 30fps https://codeberg.org/dnkl/foot/issues/481
This made me curious about image support in the emulator I use (iTerm2), and I learned that it has these cool utilities[0] that (inter alia) add aliases for imgcat and imgls, which are exactly what they sound like.