I understand that if you don't know anything about the language or what is a flake, it may be a little bit difficult.

But really, adding a new package to your environment once you have a flake setup, which a minimal one is trivial, is just adding the name of the package.

Here you have a flake.nix example from leptos. https://github.com/leptos-rs/leptos/blob/main/flake.nix

You want a new dependency? Add it to buildInputs. (this one doesn't have packages setup, but anything in the attribute set packages will be available in path)

You want to search a package: https://search.nixos.org/packages (or use the cli)

you want to test a package before adding it? nix-shell -p or nix shell for example.

Heck, even if you want it more easy, you could write a tool in less than 100 lines that adds packages names to .json/.yaml/.toml, which allows you to parse it using the nix language and a simple cli written with bash functions to add/remove packages if you wanted.

That's why it is hard for me to understand this project as a product, it seems like a wrapper to the most basic things :\