pageNavigator JSON elements

Hello, 

I am struggling to customise the font of the Page Navigator control. It can't be done through the front end as the font that is needed is Helvetica, so it has to be done in JSON. However, as soon as I add the JSON control in, my theme file is corrupt and won't load back in. Here is my original theme code, please can someone advise me on how and where to add the pageNavigator element:

{
"name":"IWP",
"dataColors":["#5F9C42","#116035","#58B672","#028E0B","#71C0A7","#57B956","#478F48","#B0F6B2","#3599B8","#DFBFBF","#4AC5BB","#5F6B6D","#FB8281","#F4D25A","#7F898A","#A4DDEE","#FDAB89","#B687AC","#28738A","#A78F8F","#168980","#293537","#BB4A4A","#B59525","#475052","#6A9FB0","#BD7150","#7B4F71","#1B4D5C","#706060","#0F5C55","#1C2325"],
"tableAccent":"#094782",
"maximum":"#094782",
"center":"#326633",
"minimum":"#A8AAAD",
"visualStyles":{"*":{"*":{"*":[{"fontsize":12,"fontFamily":"Helvetica","color":{"solid":{}}}],
"background":[{"color":{"solid":{"color":"#F2F9EC"}},"transparency":100}]}},
"page":{"*":{"background":[{"color":{"solid":{"color":"#FCF4E7"}},"transparency":0}],
"outspace":[{"color":{"solid":{"color":"#F9F9F9"}}}]}}},
"foregroundNeutralSecondary":"#54595F",
"background":"#F9F9F9",
"backgroundNeutral":"#5F982F",
"backgroundLight":"#FAFAFA",
"foregroundNeutralTertiary":"#795C2E",
"textClasses":{"title":{"color":"#795C2E",
"fontFace":"Helvetica"},
"label":{"fontFace":"Helvetica"},
"callout":{"fontFace":"Helvetica"},
"header":{"fontFace":"Helvetica"}}}