Do you mean "Lightroom" or "Lightroom Classic". I have "Lightroom" on my Mac and "Lightroom Mobile" on my phone and iPad. The Phone will import directly from Photos, and you can chose whether this happens automatically or manually (ie only photos you chose). The photos (and edits) then sync sync automatically to Mac and iPad, and vice versa.
I am pretty sure Lightroom Classic will not work like this but there are people who use both, Lightroom as a front end for getting photos into Classic, but you need to really know what you are doing. A great resource for all these issues is
The Lightroom Queen forum but there are LRQ ebooks as well. On the forum you get quick answers from deep experts.
Note Adobe has
this article about migrating your whole Photos Library direct to Lightroom. Not completely sure which Lightroom they mean because although they refer to it as Lightroom (ie not Classic) there is mention of catalogs which don't exist in Lightroom. Maybe because article is from 2021 and Adobe has had a major naming fiasco in last few years.
Note the method in that Adobe article and the suggestion by
@gilby101 will lose all your edits. To avoid this you could export jpegs instead and import manually into Lightroom.