Combining data from multiple GenStage producers?

I’m wondering if it’s possible to have a consumer subscribe to multiple producers and use data from both the producers together rather than independently. For example, if I have two producers which provide integers on demand and a consumer which takes those integers and adds them together.

Or am I thinking about this in the wrong way?

Yes, this blog post shows how --> http://www.elixirfbp.org/2016/08/genstage-example-no-2.html