How to specify using a different Repo for mix.gen.context?

Using mix.gen.context defaults to using Appname.Repo for the generated code.

Is there anyway to specify to use another repo, I looked but can’t find any information on this.

My app uses different databases for each context (is this a bad idea?) so it gets a bit bothersome because generating contexts means I have to do lots of manual error prone renaming etc…