M At a glance not really. The only thing that comes close is the balance graph in the app when you tap on your account balance. You could try to go to the highest peak of a month or year and take that as the value. However, afaik this graph always takes the lowest daily balance, so there could be some temporary intra-day bank balances higher than what is shown there.
Your best bet to get an easy and correct answer is probably exporting to CSV, importing that into Excel or similar software and run the calculation yourself. Alternatively if you're a programmer the API also gives you the balance after each payment so you could quickly go over a month / year worth of payments and then output the maximum.