When deploying a template into a project, if a service within the template "complements" a service that already exists in the project, and therefore requires a variable to be configured that points to the complementary service, it would be neat if you could select the variable from a drop down instead of having to type it out.

for example, the postgres metrics collector template expects that you have a postgres instance in your project for it to attach to -> https://railway.app/template/gDzHrM