Two bad drives in a RAID 1 - any way to recover data?

Okay, so this is a follow-up to my previous post here: https://www.reddit.com/r/qnap/comments/d3de9w/migrating_from_ts210_to_ts231p2_with_a_broken/

After having had the two old disks in the new NAS (but without success, it didn't migrate any data, nor did it recognize any volumes), we put the disks back in the old NAS. It did detect a previous configuration from another NAS, and it took a very long time trying to rebuild the raid. It failed with the messages I will post in the comment. Apparently now both drives are broken?

Is there any way the data on the drives can be restored? And how would I go about this? Apparently everything is still there, the disks were not formatted. But for 90% of the data, there is no backup on any other disks (which is a fail, of course).