As Chromium has supported the updated RE2 since around 116, that will likely be included in the Qt WebEngine 6.7.0 release.
https://wiki.qt.io/QtWebEngine/ChromiumVersions
It is unlikely to ever make it back to Qt WebEngine 5.15.x.
Currently, Qt WebEngine 6 has switched to building against the embedded copy of RE2, which can be reverted once 6.7.0 is packaged.
I think I will make a similar adjustment to Qt WebEngine 5, but without the plan to ever switch it back as Qt WebEngine 5 is reaching end-of-life.
--
Soren Stoutner
soren@debian.org
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