Hi,
If you need to use custom attributes in a link just use a HTML for them:
link
To be honest I see this syntax for the first time, and it seems to be a non-standard one. I cannot find it on even on https://www.markdownguide.org/extended-syntax
So at this moment we won’t add it, especially due fact that it will need changes in the markdown editor and parser. In the marked parser this syntax concept seems to be ignored by authors: https://github.com/markedjs/marked/issues/655
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