flask_jsondash/templates/partials/form-diagram-options.html
<select name="type" class="form-control">
{% for label, chart_group in charts_config.items() %}
<optgroup label="{{ label }}">
{% if chart_group['enabled'] %}
{% for chart in chart_group['charts'] %}
{% set value, chart_label = chart[0], chart[1] %}
<option value="{{ value }}" data-family="{{ label }}">{{ chart_label }}</option>
{% endfor %}
{% endif %}
</optgroup>
{% endfor %}
</select>