Routing Internet Traffic from openVPN Server -> pfSense -> openVPN Client

[iceget]

dear community,

i have the following setup:

client1, client2, client3 are connected via openVPN to my pfSense openVPN-Server.
I have activated the option "Force all client-generated IPv4 traffic through the tunnel.".

so now, my clients gets now the WAN ip from the pfsense, thats correct.

but now i have an VPN service where i have connected pfSense via openVPN client.
so my pfsense is now connected via VPN service provider.

but now my problem: i need to surf with the VPN service WAN ip address (where iam connected throug the openvpn client).
how i can route this?

my goal: i want surf with the VPN service providers WAN ip from my connected clients to the openVPN server (pfsense).

how i can do that? is this possible?

thank you very much.

many greets