Much like LWC for Salesforce, allow the functionality to inject custom HTML, CSS, and JavaScript into the Document Preview page such that it can be extended for customer use cases where they seek additional functionality that DocuSign does not natively support.

For example, it would be transformative to permit HTML5 tagging, CSS, and JavaScript to appear in the instructions portion of human steps to create a better experience for the user with help text and data from internal and external APIs to show information in real time in the document preview for a one stop shop.

The UI/UX of the document preview is so locked down and the instructions property only supports HTML 2.0  tagging at best that the ability for a user to distinguish where they are in the workflow along with other relevant data that could aid in their human decision making is not available to help.

Greater customization can help users find their way more efficiently and effectively. Using the Shadow DOM like the LWC approach would eliminate collisions in the DOM that could impact the stock DocuSign look and feel.

True ideal state would be to allow full customization of the page layout.

Just an idea.