That probably depends on your VPS provider. Some providers have bandwidth or application limits. Hetzner for example doesn't allow people to host or forward traffic from media (Plex, Jellyfin) servers (iirc). You'll just have to log in to your dashboard or browse their rules for that info.
Mostly unrelated to your question and post but you could also deploy Pangolin on your VPS and hole-punch through your CGNAT using one of their Newt tunnels. This is what I do to forward my Plex server to my friends and family outside my home, among other things.