title: Example of using Handlebars lookup helper
body: <p><a href="http://handlebarsjs.com/" rel="noreferrer">Handlebars</a> has a built-in helper called <code>lookup</code>. The <a href="https://handlebarsjs.com/guide/builtin-helpers.html#lookup" rel="noreferrer">documentation</a> is not very clear about how it works. Could I see an example?</p>