Mods might want to update the title.
By the way, it's worth noting that that blessing doesn't mean as much as you'd think. The LG Ultrafines have significant quirks that you wouldn't really expect from an Apple thing.
It was either Linus or Dave2D that did some videos on external GPUs and IIRC, all AMDs work on Mac, but only a subset of nvidias do.
Since we are talking about Resolve, which is cross platform, you could just save a bunch of money by buying a PC/Linux box. Several gaming laptops have really good GPUs builtin, although Apple did finally refresh their laptop offerings.
Also keep in mind that if you want to watch video on your laptop screen, you do lose some bandwidth for the image to come back over usbc/thunderbolt (vs external display). If you do a lot of video editing and portability doesn't make you more productive, you can save a decent amount by building or buying a desktop.