How can i filter the values of a referenced collection ?

[orenxperitos]

I have a value in a collection that is defined as 'type: Types.ObjectId'
formage automatically generates a in the admin form with all the values from the referenced collection. We need to filter this collection and allow the user to select only a subset of the collection. how can i achieve that ? p.s: we are currently using formage 2.5.14