See here in the wiki, you have to export NNN_ARCHIVE. Then when you try to open it an archive you get the additional option to mount.

It uses archivemount under the hood (it’s gonna ask you to install it), and I guess this tool can also be used with other file managers. I’m gonna see if there’s some snippet to use it with the one I use (lf), or I’ll make one. I don’t know how I’ve been living without this for so long haha it’s gonna be so useful