Block placement at an adGroup level via REST API

I see there is a REST API for blocking placements at a customer level.

But I cannot find if there is an API (preferably REST) for blocking at an ad-group level.

Is it only possible to remove an existing placement, but not blocking for the future as well (like possible at an account level)?

Blocking at an account level ("NegativeCriteria"): https://developers.google.com/google-ads/api/rest/reference/rest/v10/customers.customerNegativeCriteria/mutate