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Injecting Magisk is a way to do it, but I have never tried it. https://www.thecustomdroid.com/install-magisk-root-android-devices/ If you try, pls don't kill your phone :)  

see also: me saying the same stuff in the thread @Linkandzelda linked xD

@mcdinner may have just found the reason we are not having any luck, and it's my fault xD. (edit: we were chatting about it in discord, feel free to join us https://discordapp.com/invite/k4NtAGy ) https://forum.xda-developers.com/pro1/development/custom-roms-lineage-t3981821 Specifically the lines "A working TWRP exists, but keep in mind system-as-root limitations." and "System-as-root means that /system is mounted as /, but it also means that recovery is a part of boot image, so flashing it as the whole boot partition won't let you boot the system. There'll be a need for TWRP installer script.". I think it boils down to the TWRP image we have will overwrite some of androids boot stuff when you flash it, so it's not gonna work this way. It works for Sailfish because Sailfish does not need androids boot stuff. There is some mention of using a TWRP install script to get around this.

I went ahead and posted there. @netman Now I wonder if it's possible to inject the content of Magisk's zip file into the factory data that gets flashed then?

Found a thread on xda about TWRP,  https://forum.xda-developers.com/pro1/development/custom-roms-lineage-t3981821 Maybe system-as-root is the problem when flashing TWRP ?