When the Assembler service interprets the following DDX expression, it creates an XML form that containsanother XML form. The myFragment subform from the myFragmentSource document is inserted at themyInsertionPoint in the myFormSource document.Example: Dynamic assembly of form fragments<DDX xmlns="h...

It could be possible , but it has not been tried or verified by the product team

https://acrobat.adobe.com/link/track?uri=urn:aaid:scds:US:ee24962e-caea-4e8b-863b-2534e7f35386 https://acrobat.adobe.com/link/track?uri=urn:aaid:scds:US:df70a402-0fbc-4be7-8586-db0bf3a8879a     add the following entry  /content/AemFormsSamples/assemblerservice in using http://localhost:4502/system/...

I have it working. will send you the sample code soon

I will send a sample 

 

https://help.adobe.com/en_US/livecycle/11.0/WorkbenchHelp/WS92d06802c76abadb-6aa73c0c1291dd1892a-7fe9.2.html

Did you name the insertion point correctly in the xdp?

It is supported in AEM forms   

https://experienceleague.adobe.com/docs/experience-manager-65/forms/administrator-help/configure-acrobat-reader-dc-extensions/updating-expired-reader-extension-certificates.html?lang=en