Accessing a service using my own domain, without setting the ip in the nameserver

I have a grafana dashboard, an nginx-ingress and an OpenVPN service running in my cluster just fine, and I am able to reach everything I need using the cluster IP, but I want to use a domain name, lets say grafana.my-domain.com. How can I achieve this?

This might be some usefull information:

My grafana service:

▶ k get svc --namespace monitoring
NAME                                               TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
doks-cluster-monitoring-grafana                    ClusterIP   10.245.162.148   <none>        80/TCP                       120m

My OpenVPN service:

▶ k get svc --namespace access    
NAME      TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
openvpn   ClusterIP   10.245.122.233   <none>        1194/TCP   56m

My nginx-ingress:

▶ k get svc --namespace nginx-ingress
NAME                               TYPE           CLUSTER-IP       EXTERNAL-IP       PORT(S)                                     AGE
nginx-ingress-controller           LoadBalancer   10.245.199.175   xxx.xxx.xxx.xxx   80:31883/TCP,443:32254/TCP,1194:32021/TCP   48m
nginx-ingress-controller-metrics   ClusterIP      10.245.185.36    <none>            9913/TCP                                    48m
nginx-ingress-default-backend      ClusterIP      10.245.242.220   <none>            80/TCP                                      48m

My CoreDNS:

▶ k get svc --namespace kube-system  
NAME                                                 TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)                  AGE
kube-dns                                             ClusterIP   10.245.0.10   <none>        53/UDP,53/TCP,9153/TCP   143m

My /etc/resolv.conf:

▶ cat /etc/resolv.conf
# Generated by NetworkManager
search localdomain
nameserver 10.245.0.10
nameserver 192.168.1.1

My CoreDNS configmap:

▶ k describe cm --namespace kube-system coredns       
Name:         coredns
Namespace:    kube-system
Labels:       <none>
Annotations:  kubectl.kubernetes.io/last-applied-configuration:
                {"apiVersion":"v1","data":{"Corefile":".:53 {\n    errors\n    health\n    ready\n    kubernetes cluster.local in-addr.arpa ip6.arpa {\n  ...

Data
====
Corefile:
----
.:53 {
    errors
    health
    ready
    kubernetes cluster.local in-addr.arpa ip6.arpa {
      pods insecure
      fallthrough in-addr.arpa ip6.arpa
    }
    prometheus :9153
    forward . /etc/resolv.conf
    cache 30
    loop
    reload
    loadbalance
}

Events:  <none>