Any step-by-step guides on how to pass through headers to K8s pods?

I have a site that was deployed in Kubernetes and it's using the NodeBalancer from Linode. I use let's encrypt with a cert-manager and issuer on the cluster.
All that works great but I am trying to get client ip's passed through the site so the site can do some geolocation to compare coordinates and distances on a map.
Unfortunately this doesn't work because my pods are getting the LoadBalancer's IP instead of the client IP.
I've read many guides about setting up the LoadBalancer to terminate the SSL at the LB and then let the traffic between the LB and the pods unencrypted.
My question is: if I need to use HTTPS instead of TCP at the LB level, then I need to paste the certs manually there instead of letting let'sencrypt manage the cert issuing. Is there a better way?
Is there a step by step guide that someone can write on how to properly do this?

I think @pambrosky might be able to help here or maybe someone who has done this already.
Thank you