Basically just the built-in integration but it uses the Vertex API rather than Gemini and therefore works in countries in which the Gemini API is not supported.
It will probably break. But it seems to work mostly!
Huge thanks to @tronikos for writing the vast majority of this integration!
- Create a service account in a GCP project with the
Vertex AI Userrole. - Generate a JSON key
- Paste that into the Service Account JSON box alongside the GCP project ID and the region you want to use.