Handlebars

Handlebars:

Template

{{link "See Website" href=person.url class="person"}}

Preparation-Script

Handlebars.registerHelper("link", function(text, options) {
    var attributes = [];

    Object.keys(options.hash).forEach(key => {
        var escapedKey = Handlebars.escapeExpression(key);
        var escapedValue = Handlebars.escapeExpression(options.hash[key]);
        attributes.push(escapedKey + '="' + escapedValue + '"');
    })
    var escapedText = Handlebars.escapeExpression(text);
    
    var escapedOutput ="<a " + attributes.join(" ") + ">" + escapedText + "</a>";
    return new Handlebars.SafeString(escapedOutput);
});

Input

{
  person: {
    firstname: "Yehuda",
    lastname: "Katz",
    url: "https://yehudakatz.com/",
  },
}

Output

<a class="person" href="https://yehudakatz.com/">See Website</a>