Hello,
for everyone who wants to run specific commands or applications that are not included in repositories or KCP. If it is not possible to find your desired app in flatpak or it is not convenient to rut it through docker, you can try to use nix package manager. From console do something like:
curl https://nixos.org/nix/install | sh
then
. ~/.nix-profile/etc/profile.d/nix.sh
next you can install package:
nix-env -i dosbox
nix-env -i wine
nix-env -i minicom
etc...