It’s best if you fill out the form instead of providing the information sparsely this way.
Anyways, I think there’s a confusion of what NGINX’s proxy_bind does. The proxy_bind directive sets the IP address/network interface used for making the call to upstream. For example, if you have 2 network interfaces, you use proxy_bind to tell NGINX which network card/interface to use.
If you need the client IP address to show at upstream, you most likely need to use Proxy Protocol.
Can you explain why you think proxy_bind is the correct approach?