Disabling prefetch for domain override forward zone?

[gcboi]

Hello,

Simple question that I cannot ascertain reading the unbound docs -

If I have

prefetch: yes

in my /var/unbound/unbound.conf

Can I then add prefetch: no

Scoped to a specific forward zone, like below:

forward-zone:
    name: "internal"
    forward-addr: 192.168.5.10
    prefetch: no

Or is this configuration not currently supported?