How to refer a binary in chromium-unwrapped?

I want to use chromium binary stored at path /nix/store/*chromium-unwrapped*/libexec/ in my module. How can I refer this? ${pkgs.chromium-unrapped} doesn’t work as there is not such package. The package is available in /nix/store after chromium compilation.

Played around in the REPL a little, does pkgs.chromium.passthru.browser work?