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Unfortunately, no current API, including the Google Analytics Data API, allows you to open an already existing GA4 report. All Google APIs provide raw data as JSON, so if you want to access information from an existing report, you would need to recreate the report yourself by using the same dimensions, metrics and dates to make the request.
There is a Google Analytics Embedded API that was designed for the Google Analytics core reporting API, but it only works with Universal Analytics. I’ve reached out to the Google team and was informed there are no current plans to make it compatible with GA4.
