How to load a level from a Data Table

I’m trying to load a level from a Data Table, but to do so I need ‘World Soft Object Reference’.
It is not letting me chose ‘World Soft Object Reference’ as a data type in Structure.
How can I do that?

It’s a bit of a frig but have you tried promote to variable?

Promote what to a variable, exactly?

Edit: I’m currently loading level by name instead of object reference as a workaround.