User UUID lookup by email address

Hi,

We need to find user UUID by email address in Bitbucket Cloud app to add them as reviewers to a PR.

Found the following for Confluence: Solved: Get user account ID via API from email/username

But how can we find/access Atlassian Organization from Bitbucket workspace?
And are the Atlassian user UUID even the same as in Bitbucket?

Any hints are welcome. Thx.
Markus