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I'd probably suggest custom shapes. For example, let's assume you only have whole stars (no half-stars). You could draw 1-5 stars as custom shapes in something like PowerPoint (more details here: Using PowerPoint for Tableau Graphics - The Flerlage Twins: Analytics, Data Visualization, and Tableau ). I created the following (I've also attached this file).
I then saved each set of stars as a custom shape.
Now create a fake axis (with value of zero), change the mark type to shape, then drop Stars on the shape card. Finally, assign the custom shapes.
Many Thanks for the solution @KenFlerage
It is working