How does one resize/expand a softraid RAID1?

So, I have a failed disk in a softraid mirror.  While looking to replace it,
I want to just replace both drives and get a larger fs.
Most of my experience in recent years has been using ZFS, so I know how to
do exactly this with ZFS.  But, I can’t find a general guide or anything
specific in the docs/pages for bioctl, that describes how to do this with
OpenBSD.

Is there a way to replace a failed drive with a larger one, rebuild the
mirror onto it, then replace the smaller remaining drive with one of equal
size and rebuild onto that?  Then, a step would need to be performed to tell
the softraid device to fill the new available space, and then growfs.

Thanks.  Sorry if it is already documented somewhere and I failed to find
it in my quick search.

-Chris