Pulling entity id directly instead of map

I have an entity id which has an attr :x/places which is a db.type/ref

pull query goes as
(d/pull (d/db conn) '[:db/id :x/places ....some-other-keys] 01100001)

which returns
{:x/places [{:db/id 01110010}] ..some-other-kvs}

Is there an idiomatic way to get only eid’s for an attr while others keep their spec?
we can obviously transform after getting data from the pull but is there something that can be done on the query level itself?

Also consider that these type of query will be used more commonly and would love to keep the code simple.