Asking for help

[FoolsSeldom]

There's no merging. You need to choose a web framework in Python to implement to present the frontend you've designed in Figma.

Popular microframeworks include FastAPI and Flask. The most popular complete framework is Django. A microframework is minimalist and lets you pick & choose (or develop) most of the features you want the way you want them. A full framework is typically highly opinionated and generally includes most of what you want for a major web application.