Scenario setup for Middle Earth

People were seen playing it, but it's not listed in scenarios.

How can it happen to be available for us others to start?
thank you.

It's a map not a scenario. A scenario is where you can adjust teams, starting money etc.

I still can't use it as map and edit into a scenario?

You do can. Click on the map and then select 'New Preset/Scenario', thought I don't know if Talos allows it.