These settings affect the Footnote displays. The footnote links are formatted using CSS in the Article Template.

"format": {
  "fonts": {
    "footnote": {"name": "Avenir-Light", "size": 16}
    },
  "colors": {
    "footnoteBackground": [125, 125, 125, 1.0],
    "footnoteText": [125, 125, 125, 1.0],
    "footnoteBorder": [125, 125, 125, 1.0]
    },
  "padding": {
    "footnotePadding": [5, 5, 5, 5]
    }
  }