You can use custom maps in graph builder. Here is an overview:
https://www.jmp.com/support/help/en/15.1//index.shtml#page/jmp/custom-map-files.shtml
Here's where you can download the maps shapes for 96 and 384 well plates.
https://community.jmp.com/t5/JMP-Sample-Data/Micro-Titre-Plate-Shapes/ta-p/21484
Here's another blog with directions on how these were made:
https://community.jmp.com/t5/JMP-Blog/New-shapes-in-JMP-Microtitre-plates/ba-p/30265
If you need need a different size - here is another set of maps, but they are squares and not round wells:
Microtiter Well Plate Map Shape Definition File - 6, 12, 24, 48, 96, 384, 1536 and 9600 well
