HDA Processor - how to drive a ramp or vector parameter?

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I have a setup where all the parameters of my HDA are being driven by work item attributes using the special attribute arrays in PDG -
hdaparms_floats
hdaparms_ints
hdaparms_strings
hdaparms_buttons

https://www.sidefx.com/docs/houdini/nodes/top/hdaprocessor.html [www.sidefx.com]

However there doesn't seem to be any way of driving ramps parameters or even color or vector parameters from work item attributes or am I missing something?

Thanks for any info here!
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