First, install sunbeam.

Then create a new val referencing this val.

const sunbeamValtown = @pomdtr.sunbeamValTownFn(@me.secrets.valtown)

then switch it's visibility to unlisted.

You can then install your val in sunbeam

# install the extension
sunbeam extension install --alias valtown val:<username>/sunbeamValtown

sunbeam valtown # list your vals

sunbeam valtown --help # list available commands