Inquiry Regarding Adding Table of Contents in Word Documents Generated via XHTML Smart Service

We utilize the XHTML smart service to generate Word documents. Following the generation of multiple Word documents, we merge them to create the final document. Our specific requirement is to include a Table of Contents in the final Word document. Could you please advise on the best approach to accomplish this?

Additionally, it's important to note that we do not rely on Word templates for document generation. Instead, we create HTML content using the XHTML smart service, which is then converted into Word documents.