How does 2FA work on Lemmy?

When I try to add 2FA, I see the following in my settings, but clicking on it tries to open some external program through my browser: I just want to add an OTP through my 2FA app on my phone. Does lemmy not support this? How do I use what it does have? I saw this issue on GitHub, which appears to say that 2FA was added, but I'm not sure if it is referring to this or something else.