I'm building a Low Search form to filter channel entries by Solspace Tag GROUP fields. I have installed Low Search Tag (http://github.com/low/low_search_tag) but it looks like my only options are filtering by individual tags, ex:
<select name="tag_id:group1[]" multiple="multiple">
{exp:tag:cloud tag_group_name="group1"}
<option value="{tag_id}"{if tag_id IN ({low_search_tag_id:group1})} selected="selected"{/if}>
{tag}
</option>
{/exp:tag:cloud}
</select>
But I need a similar select dropdown in my form showing the Solspace Tag GROUPS.
CHANNEL FIELDS: Each Tag GROUP belongs in its own channel field (screenshot).
What name="" attribute do I need for a similar dropdown of Tag Groups so that if a Tag Group is selected, entries with at least one tag in the selected Tag Group will be included in search results?