View file Upload/src/addons/Brivium/CustomNodeIcon/_data/options.xml

<?xml version="1.0" encoding="utf-8"?>
<options>
  <option option_id="brcniDefaultSize" edit_format="template" data_type="array">
    <default_value>{"width":"","height":""}</default_value>
    <edit_format_params>brcni_option_template_defaultSize</edit_format_params>
    <sub_options>width
height</sub_options>
    <relation group_id="brCustomNodeIcon" display_order="10"/>
  </option>
</options>