'How to query a document from a specific collection im MongoEngine

is there a way to query documents from a specific collection via mongoengine?

e.g:

class GroupDetailData(Document):
        
user_name = StringField(Required = True, unique = True)
    
meta = {
    'db' : 'group-messaging',
}

*lets say that we have 3 docs under a collection named 'a' and a collection named 'b'

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