Mount + union change config without unmounting?

I'm looking to mount my union remote. Is there a way to dynamically update the union running config? I'd like, at times, to mark certain upstream remotes as :nc, and to add remotes - both without umount & remount.

With trapexit/mergerfs, they provide a pseudo file to such Runtime Adjustments.

Apologies in advance if I missed this in the documentation.

There isn't a way to do this yet.

It's been requested before though.

The rclone way would be to do it through the remote control interface.

It makes sense for this possible feature to live in the remote control interface. I appreciate the response.