Updates for variables

source/en/custom-fields.md

@@ -480,6 +480,13 @@ $details - Details label
 $item - Item label
 $description - Description label
 $entity_footer - Entity footer label/value
+
+$secondary_font_url - The URL to the font resource
+$secondary_font_name - The name of the secondary font
+
+$font_size - The size of the font selected in the settings
+$font_name - The name of the primary font
+$font_url - The URL to the primary font resource
 ```
 
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