How to scope a TLSOption's namespace in a Kubernetes Ingress annotation?

Traefik Traefik v2
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I am trying to use a k8s Ingress with Traefik and want to add mTLS verification to that Ingress. So, I have defined a TLSOption in the same namespace as the Ingress. Now in the docs at https://doc.traefik.io/traefik/routing/providers/kubernetes-ingress/#on-ingress I can use the annotation as traefik.ingress.kubernetes.io/router.tls.options: foobar but this does not say anything about the namespace the TLSOption is in. When using an IngressRouter, the namespace has to be mentioned when using a TLSOption.

So, how do I specify the namespace of the TLSOption in an Ingress annotation. Do I need to mention if the TLSOption and Ingress are in the same namespace?

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Did anyone find the answer to this question? How to address the tlsoption in the Ingress annotation correctly?

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Via traefik.ingress.kubernetes.io/router.tls.options: <resource-namespace>-<resource-name>@kubernetescrd

(Source: TLS - Traefik)

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