The following user reports that exporting .md/txt worked on his machine using the snap package, apparently using another it didn't work (he didn't yet mention what package was used).
His system specs:
Intel® Core™ i5-4200U CPU @ 1.60GHz × 4
Ubuntu 22.04.05 LTS 64-bit
Wayland
GNOME Version 42.9
I'll try to get more information from him.