I’m a big fan of graphs too! Although I appreciate the fact that this won’t be the first thing on every Monzo user’s list of most wanted features.
It sounds like you might be an Android user? On iOS, users can use the search feature to filter their data & then download it into a spreadsheet…search is one of the next items on the roadmap for Android, although it’s not been confirmed (it might be worth asking) that exports will be included yet -
https://community.monzo.com/t/search-on-android/7898?u=alexs
If you’re a developer, you can use the API to access your transaction data, then build graphs for it in an app (my guess is this is how the high-powered analytics tools will be built) & some users have started doing that already…