Global variable acquisition problem

[minliuhua]

english ：I want to set global variables and retrieve them from markdown.
For example, how to obtain the version in packagejson in markdown, if it is obtained in a code block

Chinese：我想设置全局变量，然后markdown里面获取。
比如package.json中的version，如何在markdown中获取，如果在代码块中获取

[Mister-Hope]

vuepress/core#1622

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