On the original contract in 2016, Germany also bid and in all likelihood could have won, since Germany has far more experience with building non-nuclear subs with Diesel or fuel-cell drives. France had to start the designs almost from scratch since they offered a redesign of their nuclear subs. France desperately wanted the contract and probably only won the bidding by intentionally bidding too low and too quick, downplaying their technical challenges. This behavior of France has bitten various European supposed allies and supposed good neighbors a number of times. Either they got outbid by a phony French bid. Or they were customers of such a bidding process, getting endless delays and price overruns.
So I'd be surprised if there were any substantial EU backing for France in this matter.
Some of the press coverage back then and now: https://thediplomat.com/2016/01/has-germany-lost-the-bid-to-... https://www.reuters.com/article/us-australia-submarines-comp...