Use REQUEST for cross doc data exchange Grist REST API

Hello Grist team.
Integration with n8n is very good, but it takes a long time and requires third party services, why not simplify tasks for users?

The idea came up to use REQUEST to request data in another document using https://{subdomain}{docId}/tables/{tableId}/records
The idea was not bad but it was a trigger formula Authorship columns - Grist Help Center I found only user.UserRef it doesn’t look like a user API key.
Why can’t we get the API key for the current user, because it’s current and it won’t affect security?

On the other hand, what if several values ​​are returned?

In my search I found something tasty _grist_External_database. … Mmm…