There are two options that I can think of,
1. The latest chart widgets provided by AtlasUI, has auto-refresh property, works well in 7.13.1 not sure about 7.10.0. But I would suggest upgrading to latest modeler version if possible. Refer link below.
2. With the ChartJS widget you don't get to refresh it atleast for now, so you would have to use MF timer widget from Appstore - https://appstore.home.mendix.com/link/app/105695/ to set interval to call your WS MF repeatedly.
I would suggest you check out the AtlasUI way. Good Luck!