Local traffic Policy, SNAT action

but at the match conditions I couldn't find source address, in TCP.

no parameter means source address.

e.g.

root@(ve11c)(cfg-sync Disconnected)(Active)(/Common)(tmos) list ltm policy cpm1
ltm policy cpm1 {
    controls { forwarding }
    requires { tcp http }
    rules {
        rule1 {
            actions {
                0 {
                    forward
                    select
                    snat automap
                }
            }
            conditions {
                0 {
                    tcp
                    address
                    matches
                    values { 172.28.24.0/24 }
                }
            }
            ordinal 1
        }
    }
    strategy first-match
}