Had somebody already tried this? It looks like they have posted something. Looks good to me. Keep in mind, it’s a community build, so do not ask Jolla for help. And no, I have not tested it myself.
https://wiki.merproject.org/wiki/Adaptations/libhybris/Install_SailfishOS_for_fp2 (281 MB)
Update: For those that hate to read 
You have to install it on top of an existing Android using fastboot. Only userdata.img and boot.img are provided.