Can PAAPI support more than 2-levels of auction?

looks like PAAPI only supports upto 2-level auctions (a top-level auction plus a 2nd-level component auctions). In today's contextual bidding flow, there can be more than one SSP between the publisher and the DSP. Assuming the top-level auction is run by the publisher/their ad-tag/their-adServer/etc (ie not one of the SSPs), then it is impossible for each of the SSPs to participate in the same PAAPI auction as they would in the contextual auction.

Put it differently, I would like to run a 3-level auction in PAAPI:

level1: top-level auction by the publisher-adServer
level2: component auction by the SSP (SSP1) which the publisher is directly connected to
level3: component auctions by each of the SSPs (eg SSP2, SSP3) that get requests from SSP1

if I construct an auction config as outlined above and call runAdAuction, it fails with
TypeError: Failed to execute 'runAdAuction' on 'Navigator': Auctions listed in componentAuctions may not have their own nested componentAuctions.

Has anyone run into this or considered multi-level auction in PAAPI flow?