[Feature Request] `accounts.calendar.<name>.remote.urlCommand` to hide calendar source url

[ItsLiyua]

Module Name

accounts.calendar.<name>.remote.urlCommand

Requested Feature

I have a webcal calendar which doesn't have a password or username. Just a long url with a token in the parameters. Since it doesn't have a password and I do not control the service providing said calendar I'd like an option to hide the url using a file (sops-nix) or command (to read the sops-nix file). I don't want to have my calendar public. Even if it's only read-access.

So I ask for the option to pass in the url using a command (and maybe the username as well for people who use a pseudonym online but have to use their real name for their calendar login).

Current Limitations

I cannot have my hm config read a calendar account url from a file (outside the flake directory) without making the configuration impure.

Additional Context

No response