Power Bi Json Theme - Pivot Table Row Subtotal Formatting not working

Ok, solved it myself after trying different stuff. I had to go to the subtotals section and define font for rowsubtotals and columnsubtotals separately., like so: 

"rowSubtotals": true,
"fontFamilyrowSubtotals": "Calibri",
"fontSizerowSubtotals": 10,
"columnSubtotals": true,
"fontFamilycolumnSubtotals": "Calibri",
"fontSizecolumnSubtotals": 10

This is the whole solution:

{
	"name": "MatrixTemplate",
	"visualStyles": {
		"pivotTable": {
			"*": {
					"stylePreset":[{
                    			"name":"Default"
                			}],
					"grid": [{
					"gridVertical": false,
					"gridVerticalColor": { "solid": { "color": "#F4F4F4"}},
					"gridVerticalWeight": 2,
					"gridHorizontal": false,
					"gridHorizontalColor": { "solid": { "color": "#F4F4F4"}},
					"gridHorizontalWeight": 2,
					"rowPadding": 4,
					"outlineColor": { "solid": { "color": "#F4F4F4"}},
					"outlineWeight": 2,
					"textSize": 10,
					"imageHeight": 100
				}],
				"columnHeaders": [{
					"fontColor": { "solid": { "color": "#ffffff"}},
					"backColor": { "solid": { "color": "#142640"}},
					"autoSizeColumnWidth": true,
					"fontFamily": "Calibri",
					"fontSize": 10,
                    "bold": true,
					"alignment": "Left",
					"titleAlignment": "Left",
					"urlIcon": true,
					"wordWrap": true
				}],
				"rowHeaders": [{
					"fontColor": { "solid": { "color": "#0e1622"}},
					"backColor": { "solid": { "color": "#ffffff"}},
					"outline": "Frame",
                    "outlineColor": { "solid": { "color": "#142640"}},
                    "outlineWeight": 1,
					"stepped": true,
					"steppedLayoutIndentation": 12,					
					"urlIcon": true,
					"wordWrap": true,
					"fontFamily": "Calibri",
					"fontSize": 10,
					"alignment": "Left", 
					"showExpandCollapseButtons":true
				}],
				"values": [{
					"fontColorPrimary": { "solid": { "color": "#0e1622"}},
					"backColorPrimary": { "solid": { "color": "#ffffff"}},
					"fontColorSecondary": { "solid": { "color": "#0e1622"}},
					"backColorSecondary": { "solid": { "color": "#F4F4F4"}},
					"bandedRowHeaders": true,
					"valuesOnRow": true,
					"outline": "Frame",
					"urlIcon": true,
					"wordWrap": true,
					"fontFamily": "Calibri",
					"fontSize": 10
				}],
				"subTotals": [{
                    "rowSubtotals": true,
                    "fontFamilyrowSubtotals": "Calibri",
					"fontSizerowSubtotals": 10,
                    "columnSubtotals": true,
                    "fontFamilycolumnSubtotals": "Calibri",
					"fontSizecolumnSubtotals": 10,
					"applyToHeaders": true,
					"perRowLevel": true,
					"perColumnLevel": true					
				}]
			}
		}
	}
}