Are you talking about the actual gimp plugin interface?
It's certainly possible with G'MIC, just by using any resize type command. The gimp plugin interface is "deprecated" and will be moving to gegl (i.e. gegl buffers). I suppose some example of use can be seen in gmic_gimp.cpp but there are docs about it elsewhere.
Edit: since you posted in G'MIC discussions, I'll assume you mean G'MIC
A basic resize example: -r 200%,200%
It just occurred to me you might be fighting with the "custom code" filter - it limits the size!
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