Storing Extra metadata in an issue

Is there any way to save structured meta data in an issue apart from writing it to a comment for later reading?

For example, lets say I had some additional fields I wanted to attach to issues. I could store these on my application, but if I wanted to keep the data with the issue on github? 

I don’t see anything in the V3 docs, but thought I’d throw it out there in case someone had a clever method figured out.

There is an easy trick to add metadata to anything that has markdown text. Just place JSON into an HTML comment and it will not render, but you can parse it out again.

An example of code doing this:


Hey, that’s a great trick. Thank you for sharing it.