Unbound external Domain exclude

[QWERTY]

Hello,
Is there a way to exclude an external subdomain for unbound and redirect to for example 8.8.8.8 instead?
I have an nginx running and need a certificate from one of my domains. When unbound is running, I cannot reach the domain (unknown host).
Various attempts have failed. Suggested solutions are very welcome.

 

[dave14305]

forward-zone:
  name: sub.mydomain.com
  forward-addr: 8.8.8.8
  forward-addr: 8.8.4.4

Did you try something like this?

 

[QWERTY]

Yes, I did, with no effect.