I agree that would be very impressive. I think it’s important to also acknowledge that to be a fantastic junior engineer, you don’t have to be an entrepreneur. A lot of the factors you’re bringing up touch on (tremendously valuable) ancillary skills.

My advice: don’t boil the ocean, show you can have really high quality craft. Be playful and engaging. Show the meta work. Have good git hygiene. Write a blog post about why you refactored something and ask for public code review. Show from afar that you’d be great to work with.