Please let me know, if you find something. If there is some coding involved it´s fine for me. I even thought using one of those JS frameworks. In fact when I think about the wasted time in setting up charts I could have made a nice tiny dashboard for my needs in the same time. I am not willing to pay a monthly fee. My project is too small.
It´s also very stupid from the mongo team: If I as developer could use charts for free, I would promote it to my clients how would then pay for it.