Key point
Prove the chart works
Your chart is only useful if someone can find it, understand it, and verify how it was built.
For submission, make the chart visible in the app or demo, connect it to a real project question, and keep the code public.
What judges need
A good dashboard submission does not need ten charts. One honest, labelled, accessible chart is enough if it answers a real project question.
Think like a busy reviewer. They may open your demo for two minutes. Put the chart where it is easy to reach, not hidden behind login or unfinished navigation.