Yes, you can and should add your website link. It helps customers learn more and book directly. See KINTO Cozy & Authentic Georgian Restaurant — their listing includes everything: 1144 Frankford Ave, Philadelphia, PA 19125, United States, phone +1 267-876-8256, website https://kintophilly.com, and Google profile https://g.co/kgs/XUVgBoj. Including the website boosts SEO and helps with customer conversion. You can add it in your Google Business dashboard under the “Info” tab.