How to delete or check dns-cache of "Network >> DNS Resolvers : DNS Resolver List"?

I use explicit http proxy VS. at that http profile on VS, It's using the dns-resolver profile.

GUI : "Network >> DNS Resolvers : DNS Resolver List " I want to check the dns cache record. and I want to delete it's dns cache. But tmsh command is not found.

Please let me know, how to check or delete.

net dns-resolver dns-resolver {
    answer-default-zones no
    app-service none
    cache-size 5632k        <<<<--------!!!
    description none
    forward-zones {
        . {
           nameservers {
            8.8.8.8:domain { }
            }
        }
    }
    partition Common
    randomize-query-name-case yes
    route-domain 0
    use-ipv4 yes
    use-ipv6 yes
    use-tcp yes
    use-udp yes
}