Maybe look at the history section as your means of doing so? I typically like to sort of summarize it up in a way that shows other people what they'd expect from my character and the sort of stuff that they'd be up to, not as a literal biography that only details the clerical details of a sterilized past, so that it's flexible enough to never really be out of date in regards to how someone could interact with my character.
tho it's still a nice exercise in forming a bio for the perspective of other writers that might want to write with you, could probably fit in as its own thing I guess. In my case I feel like it'd be a little redundant, I don't really want to have to have another section in my bio that restates something already in there, and the bio template provided in the character rules are the required minimum so unless that changes or is a bit more nuanced idk if necessarily forcing people to do it is really the best way to go about it? A character creation tutorial on how to better write a bio from the perspective of getting engagement from other writers might help more.