NixOS-unstable container

I’m trying to run a single “nixos-unstable” nixos-container declaratively instead of the default (release) nixpkgs defined in my flake.

I can create such a nixos-container imperatively from a flake, but then i would lack additional functionality provided by the nixos container module, e.g. bind-mounting among others.

Is it possible to build the container declaratively from a nixpkgs-unstable input defined in my flake?