How to add the "Data Binding" option for a variable in a custom query generator BP

I could not find that option in the blueprint.
Honestly I don’t know if it is possible to do it or not in that way.
However you can bind data in other ways.

For example you can declare a public reference to any type of object.

And then you can inject that data from the EQS

I don’t know if this can help you but it’s an idea.