Did you find a solution to this problem? We are facing the same issue.
We are looking at the Google IMA DAI SDK integration solution. Using only RAF might be causing no requests to certain Google's Publishers Partners tags.
We are now blocked in the spot of not seeing the parameter to send a specific tag we want, and if the approach should be using Full service or Pod serving from the Google IMA DAI SDK.
Full service or Pod serving asks for IDs we don't have (contentSourceId, apiKey, STREAMID, etc.).
I don't know if it helps, but we are struggling with that now here.