How to configure k8s cluster LB ip to domain and how to install https port on LB

I am trying to install wordpress on google k8s infrastructure.

I can able to install the wordpress on google k8s cluster. But I unable to configure the LB Ip with https. How can I install the https/certificate on k8s cluster LB ip address ? so that I can call my wp website with https protocol.

Also I would like to know how I can map the k8s LB IP to domain name.

Thanks and Regards,
Rajagopal Baskaran.