Add JSP Page to Spring Service

I have a standalone REST service which uses Spring boot. Now I want to add some fontend on my project. My service is not complicated and it is base on this guide. I don't have the web.xml file. What should I do to add a jsp page? What should I do in my controller? Do I have to add new files? It is probably a simple question but I'm new at this and things are a little messy. Thanks in advance!