CPU-Z lists the J2 Prime (G532G variant) with a MT6737T board and a MT6735 hardware. Don't know whym
G532G also runs on Android Marshmallow, so a LOS 13 port might be better, but LOS 14 still has some features that might not be present on LOS 13.
Also: the device lacks "some" free storage (user space) and prevents a user to make a SD card as an adoptable storage (only in the OS itself. Using adb to convert sdcard to adoptable storage works fine)
We didn't know it existed before, but we're going to implement the mt6735-common (board common device tree for our mt6737t) lineageos sources.
This has two branches, 13.0 and 14.1
(mt6735 is the board of the mt6737t chipset).
This simplifies things a bit.
I hope to have a successful build during the weekend.