Not 100% sure if or where one might find a / the bespoke article, but it's quite simple (imho).
DAW - signal generator - interface output - [optional signal pad / attenuation] - coupling capacitor (1nF) - JFET gate
Mic - XLR cable - interface input - DAW - oscilloscope plugin (most DAWs have one in the stock library)
Start with said output at minimum, slowly raise it until the circuitry (
not the interface input) starts to clip on the top or bottom of the test-sinewave, turn the bias trimpot to remove the clipping, increase signal level, "rinse and repeat" until both the top & bottom clip around-about the same time (or level)

Exactly the same as you'd do with a physical, hardware signal generator and oscilloscope. Minus the expensive test gear

Mind you, you'd still need the mic connected to something that provides phantom power anyway.
[Edit] Found a video, too -
https://youtu.be/SHD4Rrwqy_Q?t=1014 Arguably a bit "long-winded", but pretty damn thorough - includes a description of how the circuitry in that particular mic works, etc.
A bit off topic, but how does one bias the FET using an audio interface and software? Got a link to an article or thread?