I created the flatpak package for NaSC.
https://github.com/scx/nasc-flatpak

I am in the process of submitting it to the Flathub repo.
flathub/flathub#867
https://github.com/scx/flathub/tree/com.github.parnold_x.nasc

It would be nice if you, as the author, decided to participate in the further development of this flatpak package.

Previous attempt:
#67
flathub/flathub#128
https://github.com/phw/flathub/tree/68bba39b79722eb89221e2bb6f78aaeea33abfd3
https://github.com/phw/nasc-flatpak