Separate Results of Calculated Column with Commas

HodgePodge47 Try using calculated formula like this: 

=TRIM(IF([PROD-1]>0,"PROD1 ","")&IF([PROD-2]>0,"PROD2 ","")&IF([PROD-3]>0,"PROD3 ","")&IF([PROD-4]>0,"PROD4 ","")&IF([PROD-5]>0,"PROD5",""))

Then apply JSON column formatting with: 

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "txtContent": "=replaceAll(@currentField, ' ', ', ')"
}

Reference: SharePoint: Replace All Occurrences of Substring in a String using JSON Formatting 

You can also use internal column name instead of @currentField in JSON. You can get the internal name of your SharePoint list columns by following this article: How to find the Internal name of columns in SharePoint Online? 

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