I have a similar problem in trying to replicate the number of clusters like esri does as a default when performing density based clustering. Solution was to create a summary table with the values I want then join back to the base feature layer and create the following dynamic text in the legend
Press the expression
Result
I also created a dynamic title in the map to reflect the current definition query since I put different results of a clustering into a single featureclass.
Press the expression button
The Result
Hope this gives you some ideas
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