I was able to resolve by overlaying the below JS. /libs/cq/gui/components/authoring/editors/clientlibs/core/js/actions/WorkflowActivator.js Thanks everyone.

@HrishikeshKa - Thanks for the response.For some reason, the custom JS is not getting invoked. I think, am missing to add the right categories value for the clientlibs that can invoke the custom the JS logic when submit is selected.

Yes @Shashi_Mulugu .Just shared some info as analysed, but still for suggestions for my usecase.

Hi @HrishikeshKa , Upon further debug, looks like start workflow form for the AEM page is created from here./libs/cq/gui/components/authoring/workflow/startworkflow/startworkflow.jsp Custom JS mentioned above would work for this usecase as well?

Hi @arunpatidar,I was referring to the start workflow option from the AEM page.

Thanks @Shiv_Prakash_Patel My question was regarding more on jcr:created which I think you are mentioning as not possible. Let me know other wise.Ideally, I could create the page using the the JSON and CURL command and like u said also am able to add the logged in user id to the jcr:createdBy. The q...

@Saravanan_Dharmaraj  - Did try this approach. It works for most part but doesn't update protected properties like jcr:createdBy. I know those are non modifiable, but in any way this too can be updated programmatically than just auto update the jcr:createdBy to the logged in userid?

Hi @AnmolBhardwaj1808 , The policy has been added to the template and saved under the property "cq:policy" for the template. Clientlibraries are being rendered. Issue is with only the Default CSS classes as shown below. I am on 6.4.8 version of AEM. 

 Thank you

Hi @B_Sravan, Thanks for the reply. But that was not the problem i was stuck with. I am able to get the clientlibs values in the experience fragment page but not the "Default Class CSS". Below is the screenshot for the same. Also not seeing the style system option on the page. I could see the value ...