The following sample configuration uses A values.

group forwardv4_group (
    SystemList = { sysA = 0, sysB = 1 }
    )

    DNS forward_group_v4_resource (
        Domain = "example.com"
        StealthMasters = { "3ffe:556::1000:5761" }
        ResRecord @sysA = { www = "10.200.56.240" }
        ResRecord @sysB = { www = "10.200.56.244" }
        OffDelRR = 1
        )