[syslog-ng] can kv-parser options be from macros

Does anyone know if I can use the enriching data to set macros that can then be used as kv-parser options. These values might change on a message by message basis. For example: parser p_kv { kv-parser ( prefix("$kv_prefix") value-separator("$kv_vseparator") pair-separator("$kv_pseparator") ); }; -- Evan