Relative links to catalog & photos

I use two computers for my Lightroom Classic, a laptop & desktop. Both Macs.  I keep all my files on Dropbox, but the path to dropbox is different for each computer.  I can't fix that.  Is there a way to identify the paths as relative to the catalog or something like that?

For example:

Laptop:

/user/username/dropbox/lightroom...

/user/username/dropbox/photos...

Desktop:

/external-drive/dropbox/lightroom...

/external-drive/dropbox/photos...

idea is:

../lightroom...

../photos...

Thanks