Hard to say. I haven't seen any device tree for Mariko yet in Lineage source. Or unofficial source for that fact. It's all foster (2015 Shield TV) code that was hacked to work for the 2017 version and the Switch as well. I haven't seen anyone working on the 2019 Shield, which is where you're going to see it first for it to trickle down to Mariko Switch devices next.
I could see it happening at some point, but I don't believe it'll be anytime soon. Some contributor will really want Lineage OS on the 2019 Shield and will do all of the grunt work one day.
Does anybody know if ChoiDujourNX is safe to run within Atmosphere for sysnand FW update?
I ask because i have an iPatched board with a fuse mismatch (somebody plugged in the wrong EMMC module) and i already used the SX Core and SXOS licence to repair another board which also had a fuse mismatch.... just unsure if it's the SX-Cores integrated firmware that protects it from brick with ChoiDujourNX or the SXOS boot.dat??