Port forwarding VPNs forward from the far end at the specific datacenter(s). Its still trafficked through the encapsulated tunnel so no an ISP provider not supporting it wouldn't come into play or matter.
AirVPN works well and allows for profiles to be created for individual machines so they use different servers or have different protocol setups. More importantly, they allow for multiple ports to be forwarded which is needed if you are using the forwards for multiple applications.
If the use case is Jellyfin, you might also look into something like ZeroTier or Tailscale. Those use an SDWAN setup so your remote devices are still able to talk to the media server (assuming it is installed there as well) without any forwarding. Otherwise, you will need to make sure to use the IP of the VPN datacenter instead of your ISP as the ISP/router shouldn't be set to forward anything. Dynamic DNS is useful for that too. Setup a dyndns cronjob on the media server to update the record with the IP of the VPN and don't worry about it.