Question World Space TMP and Batching

I have a scene with 10 world space text mesh pro texts. They're all using the same custom, imported font, and have identical text. They all use the TextMeshPro/SRP/TMP_SDF-URP shader, with GPU Instancing enabled. When I run the scene the number of objects saved by batching is 0, and when I duplicate the TMP objects in the scene the number of batches goes up linearly.

How do I batch my world space TMP text so I can have hundreds of TMP objects visible in the scene at any time?

 

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