Writer comments has now a feature of "reply". The comments page should cover that.
Target page: https://help.libreoffice.org/6.4/en-US/text/shared/01/04050000.html?&DbPAR=WRITER&System=UNIX
which means source code: text/shared/01/04050000.xhp
Olivier Hallot committed a patch related to this issue.
It has been pushed to "master":
tdf#128589 Add resolved comments in page