How to Add illustrative icon to performance tile or pivot table in Visualisation workbook

Summary:

Content (required):

As normal in analysis of OAC, we can add the icon to illustrate the meanings of figures in that chart by using Conditional formatting. But there is no similar option in Visualisation Workbook. Anyone has any idea to achieve this?

Version (include the version you are using, if applicable):

OAC 6.4

Code Snippet (add any code snippets that support your topic, if applicable):