Mongoengine field type equivalent in Mongo.Ecto

Questions / Help
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This is a simple question, …how can I define a field of type SequenceField with unique constrains using mongoengine, but using Mongo.Ecto??

dbm = DBConnection.getMongoEngine()

class Person(Document):
    personal_id = dbm.SequenceField(unique_with='account.account_id')

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