The product designer should create a user journey that is in alignment with the team that understands the user's requirements. This user journey should be documented and clearly made visible on this Miro board.
Make sure that your update is visually distinguishable from what is currently implemented.
It may be useful to sketch the screens on paper first to validate the idea with the user researcher or the person who understands the stakeholder requirements.
The product designer should then go into Figma and create screens for each step of the user journey, keeping all new elements and information contextually in the appropriate components.
It is important to not invent anything that is completely new, but instead to inform the design from the existing visual style and components. It is also important to avoid redundant elements.
After the design is done, it is important to check in with the relevant party to make sure that everything is in alignment with the user's needs.
The last step is to record a video summary of how everything works for the engineering team, outlining every single change and how everything is supposed to function.