there are threads on “parental control / child safety” in this forum, the 50+ comments thread does mention Family Link working /e/->stockrom too, but seemingly not within /e/->/e/.
r/Lineage says it is possible though as “child” device too, but you can run into issues (that seem to be solved in Q/R by now). Mind: a lot of Lineage users use Gapps instead of microG so a clear comparison falls short.
There are some scattered recommendations here and in the Lineage reddit (netnanny, mmguardian) for related keywords - would warrant a wiki-type list post what works. I myself only checked on “screen time” apps to date.