My bad. My reply was directed at @seabi. I forgot to click the reply button.
Anyway, as for your question, the answer is: it's impossible. The extension seems to only work on surface level and can only read available data. Untagged and non-rated stories which are still not on our lists are currently unavailable data. Therefore, even the extension can't help us recover our complete reading list before the crash.
At this point, all we can do is hope the devs are able to recover the lost data and will implement them back to complete our reading lists again. Otherwise, it's all about trying to find those titles on our own.

y'all did anyone try this method for scraping your old lists ? does it work ?
https://docs.google.com/document/d/14Drj0CviUhrAmZlU-DC-AtxGFQoH1_PYQ81b2Vzu82w/edit?tab=t.0#heading=h.acjitdw8v0h