Does Google Ad Manager pass highest ad value (eCPM) to PAA (Protected Audience API)?

[wojciech-bialy-wpm]

We'd like to understand how Google Ad Manager executes PAA auction - especially how winning bid value is sent to PAA (see https://support.google.com/admanager/answer/13627134?hl=en).

1. If Ad Manager passes ad creative and winning ad value (eCPM) to PAA, would it be possible to pass this value to the publisher’s ad selection logic (yield optimisation). It would enable the publisher to use Google Ad Manager in parallel with other demand sources (such as Header Bidding, publisher adserver, etc.). It would also guarantee equal position for all players.

2. If the Ad Manager does not pass ad value (eCPM), then how do You guarantee that the displayed ad, chosen between the Ad Manager and PAA, provides optimal revenue for the publisher?