Text edit for pageVars, appVars, pageParams etc

Wondering if anyone has any way or workaround to edit the contents of pageVars, appVars or pageParams in a text editor ( for initialised variables/params).

I find the variable building gui is quite limiting and human error prone once you have more than a few nested entities in an initialised variable. Is there a way to either edit the json with a text editor (within or external to AppGyver)?

You can already see the JSON text representation in preview in formula editor