I don’t think there is a random trabecular bone structure generator module, but if you have a microCT then you can use the actual trabecular structure of the bone. You can also copy the trabecular bone from any other image and cut it to a patient-specific shape using Mask volume effect in Segment Editor.
If you don’t want to copy-paste porous structure from real bones then you can train a neural network to generate such textures for you, for example, using MONAI toolkit.