Solved
Do we have any attribute for JSP similar to data-sly-element
When I use
<h2 class="${properties.testclass}" data-sly-element="${properties.tagType}">${properties.title}</h2> in my JSP code (In HTML it works fine)
Output
<h2 class="test" data-sly-element="h5">Title</h2>
Expected Output:
<h5 class="test" >Title</h5>