I would really like to see json or yml formatting here. Is it possible to add this in some way?

[Dr. Stefan Flemming]

This question is in reference to Atlassian Documentation: Code Block Macro

Beside XML, I think one of the most important syntax highlighting would be for json or yml.

 Is it possible to implement this in some way by myself? if not I would really like to see this in future.

[Bruno Raymundo]

Hi team,

I have created a suggestion in our system:

CONF-40070

Please vote for it! 

Regards,

Bruno

[Marcel Nick]

Meanwhile you could use  a Confluence plugin as a work-around :)