Hi @jonsnguyening, and thanks for your question!
Can I ask what your use case is, or why you want to obtain the unique values for a given metadata field?
You might be better served approaching the problem in a different way - perhaps storing these values in a set during upsert, for example.
But it would help to understand what your end goal is.
We don’t yet natively support pagination, but you could also see the workaround suggested in this thread.