Multiple select for a Collection smart field

I have a collection that has tens of thousands records.

I want to create a smart action that one if its fields is selecting multiple entities of the collection.
Since there’s lots of records in that collection, i need to have the input as a search (and not a dropdown).
I know there’s type: "Collection", but i don’t manage to have this field to be multiple selection.

Thanks!

Hello,
If you are using agent-nodejs you can follow this documentation to implement a search with a dropdown input.
Best regards,
Alban