Load Balancer private IPs or applying firewall rules to Load balancers

Hi all I have newly created K8s cluster , where I want to use to publish micro-services for other droplets in my DO account , I want to expose the K8s service using a load-balancer but only privately to my other DO droplets , and disable all public traffic ,
right now I cannot do that , there is no way to assign private IP only to a DO LB , and there is noway to apply firewall to the DO LB to restrict public IP traffic. please advice if its doable and how to do it.