how to create custom selector for learning history report?

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Hi All,

I am looking for solution to create custom selector in Plateau Report Designer (PRD).

For example, we hope to leverage user and item custom columns to serve as report selector, but as in  Plateau Report Designer (PRD), we see only limited standard delivered report selectors, such as ItemSearch or UserSearch.

Attached screenshot below is the list of custom columns as example, and I could not find Job Title as standard delivered report selector either, despite Job Title is a standard column...

Kindly share your expertise if you know how to DIY this!

And if I remember right, there is a blog post explaining about custom selector? But I cannot find it now. If you know, kindly share!

Thank you!

Best,

Jessica