According to the proot manual, the --bind option should support the ! character to avoid dereference the guest location.

> If the guest location is a symbolic link, it is dereferenced to ensure the new content is accessible through all the symbolic links that point to the overlaid content. In most cases this default behavior shouldn't be a problem, although it is possible to explicitly not dereference the guest location by appending it the ! character: -b *host_path*:*guest_location!*.