blog-static/layouts/shortcodes/bergamot_widget.html

<div id="{{ .Get "id" }}"></div>
<script>
    var app = Elm.Main.init({
        node: document.getElementById('{{ .Get "id" }}'),
        flags: { rules: '{{- strings.Trim .Inner " \n" -}}', query: '{{ .Get "query" }}' }
    });
</script>