Graphql sortkey updated_at and/or updated_at_min

[PatrickJager]

As a developer of a integration between webshop and financial/stockmanagement program I want to be able to get all newly updated Products.
This was I only have to synchronize the newly updated products/variants.
Via the Rest api I am able to order the products by updated, but when I try the sortkey updated_at or updated_at_min or updatedAt (uppercase and lowercase) I get an error.