How to predict the compressed file size?

Hello, I have a large model and I want to divide it into several data of similar size and compressed by draco. But if I segment the model data first, and then perform draco compression on each model obtained by the segmentation, the final file will be much smaller than my expected value. Therefore, I want to estimate the compressed data size, which can help me better complete the segmentation.

If there is no existing method, which code snippets should I focus on?

Thanks in advance.