Read/Write Resource element not using a file

Page 18 of the vRO Coding Guide (ver 1.0) says

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Possibly use a CompositeType, or if it is really meant for internal use then you can save the Properties object as a Resource Element

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I cannot find any way to write a JS object into a Resource Element.  Nor for that matter, to read it back as an object.  I find lots of ways to read/write files to a Resource Element, just not objects as the coding guide states.  Can anyone help me?

Thanks,

Carl L.

Oh, and if anyone is interested, the coding guide is here:

https://docs.vmware.com/en/vRealize-Automation/7.3/vrealize_orchestrator_coding_design_guide.pdf