Adding custom fields to Contextual Search

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I'm on Geneva and I'm using contextual search on the hr_case table and would like to add a custom field to the contextual search as an additional filter along with short_description. I have a matching custom field on the kb_knowledge table to search against. Given that the 'condition' search property in the 'knowledge' resource configuration applies globally to all searches, is there any way to extend the contextual search capability in this manner?

For example, I have a custom field 'Region' on the hr_case form and a matching 'Region' field on kb_knowledge. I would like the contextual search to filter results based on the selected Region on hr_case to those kb articles who have a matching Region value on kb_knowledge.

[Michael Fry1]

I made a similar suggestion here but as you'll see was told it won't work until Istanbul comes out: Need to filter Knowledge search results using contextual search to include configuration item

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I was turned on to the OneSearch app on the ServiceNow Share. It gives me exactly what I need as it relates to incorporating custom fields for more targeted searches.

[Michael Fry1]

Thanks for the update.