The app kept crashing when I tried to "share" (export) them, so I manually selected them in groups of 100 to "share" at a time. Other than that, the only issue I had with the app is that if I was typing something in the URL/search bar, it would take a while to find any matches in my browsing history.
Over half of the tabs were HN posts that I've been meaning to get back to. I keep telling myself (lying to myself?): One day I will.
[me@comupter]$ cat tabs.json | grep "page" | wc -l
17022
Yes I am a big-time tab accumulator, but I'm sure the number would be smaller if the Brave team would just implement the "Bookmark All Tabs" feature that's been requested since at least 2019: https://github.com/brave/brave-browser/issues/5711
Method to get open Google Chrome tabs from an Android phone into a JSON file (steps are identical for Brave Browser): https://android.stackexchange.com/a/199496