Note of @tdm

Alright, after way too long, I've finally gotten oreo working well enough to test. Please note:
These are beta quality, not suitable for daily usage yet.
Known issues will be listed. Anything not listed should work (but not everything has been tested).
Tested with opengapps micro arm64 8.1.
If you would like to test nougat upgrades, please let me know how that goes. I have only done a clean install so far. Keep in mind that you will need to flash oreo gapps, as gapps persistence does not work across versions.
Sources
Device
Kernel
Vendor
Prerequisites
All oreo builds require an updated TWRP to flash:
jasmine-twrp-7.1-3.2.3-r1.img
Build 2018-10-17
Known issues:

• SELinux is permissive.

• Camera shutter button is partially obscured by navbar.

AOKP Oreo:
aokp_jasmine_oreo_UNOFFICIAL_2018-10-17.zip
MD5: faffe6c263032870c29bba22b91fc090
Lineage Oreo:
lineage_jasmine_oreo_UNOFFICIAL_2018-10-17.zip
MD5: 596f244f362ddf577bf57b13429b9740