From experimentation and chatbot feedback, it appears there's no way to set entity ownership from a data source mapping. There's no or meta-property to map to, and you can't map to the special relation.

It sounds like this currently requires a Workflow (in closed beta) or an Automation that calls a back end that can make Port API calls to set team ownership.

Mapping to a regular relation under a custom name, even with a search relation, works fine. Please support mapping to an relation the same way.

As a workaround, I think we'll avoid Port's built-in ownership in favor of a custom relation on our entities, and emulate inherited ownership using mirror properties that reflect another entity's relation.