Sonoff SV GPIO pins Original Software

Hi all

I currently have my Sonoff SV switches on home assistant with it’s original firmware. I have seen that with the Tasmota firmware you are able to change the GPIO14 sensor to switch 2 and GPIO4 to relay 2 for example. Is this configuration possible on home assistant without the use of Tasmota?

I basically want to replicate what DrZZs is doing in his garage video but if possible without using Tasmota.

Thank you for the help!