Bumping a fairly "old" thread, but since it was one of the few which came up after researching the topic on importing/exporting/saving player characters for gm campaigns this thread was one of the few coming up.
I most sincerly request this feature for gm mode.
This exact question was raised during the undead reveal youtube stream in the
q&a session that was roughly 2 months ago. Any updates I missed during my research (looking at you Larian ; ))