Write Trigger on mongoDB Document

Hi can anyone help me with writing triggers on documents for insert and update?
Edition: MongoDB 5.0.2 Enterprise

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I have document A and document B, When data is inserted in Document A 4 columns should be populated from document B to document A

If you are running your database on Atlas (Mongo in the cloud), I believe triggers are an option.

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In addition to triggers, you could take a look at: