Create automatic collection with Variant metafield

[DanSal8]

How can I create an automatic collection which adds all products with at least on variant that is part of a variant metafield I have created (Location ID)

- the variant metafield is a location ID variant to show which products has a 48 hour shipping "express"

these variants are automatically being marked and unmarked with this metafield and i need to create an automatic collection with them