Add Operator to Breakdown for Assignment group 'is one of'

[tomblood]

Hi, 

I work in an instance where there are many groups from different parts of the business.
I would like to create a Visualization that uses the 'Incident backlog growth' indicator.
For other indicators I have been able to use the filter Assignment group > Is one of, but here I have only Assignment group > is, available. 

I'm looking for advice on how to update the operator and if possible, tips on refining OOTB data sources to a set of specific groups.  

[Mark Manders]

I think that the issue is with the indicator. It's a formula indicator.

You can create a dashboard with the visualizations on them and use an overall filter that allows for multiple groups to be selected...