herolulu Hmm, I'm not sure I fully understand the content of your question, but is it correct to say that you are asking where you can check the correct scale when importing a skeleton that has been exported once? If the skeleton's texture was scaled when exporting, the scale information is saved in the atlas file.
If you set the scale based on this value when importing the skeleton data, you can set the correct size for all the attachments at once without having to manually modify the size of each attachment:
The following blog post, which explains how to import skeleton data, also explains this, so you may find it helpful:
Blog 导入骨架数据 #疑难解答 - 为何有些部分比正确尺寸小或大?