Nah, you are not blind, I can't figure that out either. we will put the suggested feature (share to chrome) in the list, if it's not too tricky, likely it will be there in the next version since it's something affecting the HN consumption experience :)
Isn't this explicitly a chrome issue? My understanding is that apps need to "advertise" themselves to appear in a share sheet, so they appear as an option for the user?