Complex Query find

Lets say I have this entity
user (email, firstname, lastname)
account (user, role)
university(name, account)

How can I get all the university where they have at least one user with the email “” ? In one request with find ?

Please provide sample documents we can cut-n-paste. Experimenting using a schema is feasible but arduous since we have to create out own documents. It is way more easier to work with your documents.