QGIS Composer labels with expressions - Custom functions

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I'm trying use GetPrint request with qgis server and I find feature that you can assign value of function to label (with id) ex.

http://qgis.local/cgi-bin/qgis_maps...STYLES=&FORMAT=png&TEMPLATE=Template1&field1=[%25 now() %25]



From QGIS 2.8 there is possibility to make your own function so I try with built-in custom function func(value1)

http://qgis.local/cgi-bin/qgis_maps...STYLES=&FORMAT=png&TEMPLATE=Template1&field1=[%25 func('a') %25]

There is way to make it work?



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