SearxNG not working as TrueNAS app due to DNS

Does anyone have issues with the SearxNG app? When I launch it as a TrueNAS app, teh UI appears, but all searches fail due to timeouts. I could solve it by keeping it in dockge and specifying

    dns:
      - 1.1.1.1
      - 8.8.8.8

This could be related to the fact that I use pihole and my TrueNAS server also uses pihole (primary DNS) and 1.1.1.1 (secondary DNS). But why do I only see problems with SearxNG? Anyone?

And I suppose it would be great if the SearxNG app would allow for a DNS configuration.