How to automatically convert URL text to URL link?

Dear all，

I have exported an Obsidian notebook,named "output.IT", which is actually a folder of notes and sub-folders.

The notes are well imported into Siyuan, except that all the URL links become a normal text,
e.g. the URL link, http://abc.com becomes a plain text only: http://abc.com

so how to automatically convert all URL text to URL link?

Thanks for any kinds of help！