if i define a static param value in

        /params
                MY_STATIC_IP=1.2.3.4

i can use, e.g.,

        /snat
                SNAT($MY_STATIC_IP) ...

if, instead I define an AddressVariable

        /init
                MY_DYN_IP=$( cat /some/path/to/latest_EXT_IP )

is this, then, valid usage

        /snat
                SNAT(%{MY_DYN_IP}) ...

?

reading @

        https://shorewall.org/configuration_file_basics.htm#AddressVariables

i _do_ see examples of the %{} in /rules, but not explicitly elsewhere, e.g., 
in /snat.


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