How is the content of the Custom Jira Chart macro configuration export encoded?

[ariel_chiang]

When I use the Export function of a custom jira chart macro's configuration, 

I get the current macro configuration, but the values seem to be encrypted.  (As shown below)

 

I'm trying to automate a confluence page posting, and I need to programmatically enter the "query" value through rest api. In other macros (for example, custom jira chart - issuelist), I was able to simply replace the "query" value to plain jql strings and it worked. But with this specific Macro (custom jira chart), only encoded values seem to work. Therefore I would need to know how is this encoded? Or if there's any other way to programmatically create this macro through rest api?