(taken from the website) FileBot is the ultimate tool for renaming and organizing your movies, TV shows and Anime. Match and rename media files against online databases, download artwork and cover images, fetch subtitles, write metadata, and more, all at once in matter of seconds. It’s smart and just works.
Upstream has been contacted: Yes, Feature Request: Flatpak for Linux - Page 2 - FileBot
We might want to wait for the next version, as that seems to let us use zenity instead of javaFX for filedialogues.
I otherwise started it here https://github.com/razzeee/net.filebot.Filebot
But the appstream file is done manually