building on the code from Alfonso Annarumma: https://github.com/anfeo/blender_addon_bake_UDIM

bake UDIMs in Blender

• Select Object
• go into edit mode and create desired amount of UDIM tiles
• once you made your tiles and filled them, go to "Image" in the UV editor
• click save
• exit edit mode in the 3D viewport
• go to the shader editor and create a image texture node
• Select UDIM data block
• make sure the texture node is selected
• Set Bake Parameters
• Click on Bake for UDIM Image

Youtube Link

https://www.youtube.com/watch?v=msVZb_Ola5E&t=3s&ab_channel=AsgerLanghoff