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I found a solution to delete the entries with a javascript portlet which is using the Liferay.service() method. I created a liferay module project in my eclipse IDE with the mvc-portlet template. Then I added the following code to the view.jsp and deployed the portlet. Now I can enter the start and the end commerceWishListId in a form.

<%@ include file="/init.jsp" %>

<input id="start" label="Start"></input>
<input id="end" label="End"></input>

<button value='send' id="submit" onclick="myFunction()">Delete</button>

 <script type="text/javascript">
             
         function myFunction() {
             const start = document.getElementById("start").value;
             const end = document.getElementById("end").value;
             
             for (var i = start; i < end; i++) {    
                 console.log(i);
                 object = deleteWishlist(i);
                 console.log(object);
                 }
         }
    
         async function deleteWishlist(wlId) {
              
            const response = await Liferay.Service(
                      '/commerce.commercewishlist/delete-commerce-wish-list',
                      {
                        commerceWishListId: wlId
                      },
                      function(obj) {                  
                          console.log(wlId + "deleted");    
                      }
                    );
                   return(obj);
            }    
</script>
    

The program is working but sometimes it stops deleting after a few thousand entries. I hope a javascript expert can help me to improve the script. I think it's an issue with the async request.