I think this phone is too new. /e/OS depends on LineageOS so, if there’s not build of LineageOS, there won’t / can’t be a build of /e/OS. (There are some exceptions, but that is generally true).
Looking at XDA Forums (where most custom ROMs are publicised) there don’t seem to be any custom ROMs around yet for this device. As I said, I think it’s too new.
One way to get custom ROMs (including /e/OS) running on newer devices is to try to install a Generic System Image (GSI). This post is a good place to start