Hello! I’m sorry that I write this task in my broken English.
My wiki is ZhwpWiki (zhwpwiki.miraheze.org). I want to add a external link like this:
[[zhw:$1]] will be redirected to https://zh.wikipedia.org/wiki/$1
Because my wiki is about Chinese Wikipedia, I want to have the authority of importing Chinese Wikipedia’s pages. That will be convenient for me to write the article.