there are samba ports for Android (incidentally, by ppl into building androidtv boxes). But unlikely for /e/ to build this when there are long debates on more user facing Apps. But you can build yourself - https://github.com/GTA-Electronics/Android-samba
for adhoc sharing of folders and files from an Android, little http servers aren’t a bad choice
if your usecase is more into streaming media files from an Android than plain file sharing, the DLNA standard is still kicking and even old networked TVs have a browser for it as would modern Apps. It’s a mix of universal plugnplay, http and xml - https://f-droid.org/packages/com.m3sv.plainupnp/ (and more)