How can I implement a custom syntax?

[RaenonX]

Say if I want to enlarge text like this !!text!!, how can I implement that?

I am currently using react-markdown. I tried using component options for doing such, but I found that nested syntax like !!**Bolded and enlarged**!! won't work.

[wooorm]

See https://github.com/micromark/micromark#extensions

[wooorm]

That being said: you probably should not, as outlined in that chapter