I believe there is support for AT&T syntax, but since Intel syntax is widely used, it would be great if support could be added - like ‘x86asm’ in highlight.js
Being a user of Bookstack, Standard Notes and Silverbullet.md - I would also be very glad to have support for Intel syntax. I am no developer, so I can’t help you out, I’m afraid.
This may be of help:
Total noob here, so not even sure how to use that code.
But thanks anyway, maybe someone else is able to get it to work.