Not sure if there is an equivalent for LineageOS but GrapheneOS offers an almost completely automated flashing process in Chrome via WebUSB and gives instructio

Not sure if there is an equivalent for LineageOS but GrapheneOS offers an almost completely automated flashing process in Chrome via WebUSB and gives instructions for the actions you need to take on the phone itself when necessary throughout the process (on my Pixel 4a I just needed to press volume up and power to unlock the bootloader when prompted by the installer). The whole process was amazingly easy when I did it and took less than 15 minutes.