Add attribute to detected keywords in ACE editor -

I have created custom mode in ace editor for a custom markup in my app (which works great). I want to add a contentEditable = false for all keywords

In fact, Ace Editor is a and lt; Span class = "ace-keyword" & gt; Xxxx & lt; / Span & gt; Around the keywords, but I need to add attributes to these spans. I do not know where it should be done. Any insights?

Cheers