How would I make a block helper that encloses the inner template with a template tag?

[dexterdy]

So, I wanna make a block helper that encloses the inner template with a <template></template> as well as functionality similar to the {{{raw}}} helper. How would I go about doing that?

If I'm correct, I should make a new Template with a single TemplateElement, which is a HTMLExpression, which references the original template, but I'm unsure if that is indeed correct, nor do I know how to achieve the escaping functionality of {{{raw}}}.

fn client_only<'reg, 'rc>(
    h: &Helper<'reg, 'rc>,
    r: &'reg Handlebars<'reg>,
    ctx: &'rc Context,
    rc: &mut RenderContext<'reg, 'rc>,
    out: &mut dyn Output,
) -> HelperResult {
    let template = h.template();

    let mut new_template = Template::new();
    new_template.elements = vec![TemplateElement::HtmlExpression(Box::new(HelperTemplate {
        // not sure what to do for most of these fields
        name: todo!(), 
        params: todo!(),
        hash: todo!(),
        block_param: todo!(),
        template: template.cloned(),
        inverse: todo!(),
        block: todo!(),
    }))];
    new_template.render(r, ctx, rc, out);
    Ok(());
}

Am I doing this right? What am I missing here?