How can I have a JSON array or BBCode recognize global variable?

I'm trying to include the value of a global variable in a JSON array or BBCode. Could anyone please help?

For E.g.

(Obviously,

[@UserName_GV]

There is no standard way to do this. You will need to use your own tags and then replace them before displaying the text. For example, use {username} tag in text. And add this action:

MyText Set text to replace(Array.at(0,0), "{username}", UserName_GV)