Hi Ather,
Mendix does not have a mixed chart capability (with their chart package). You can use AnyChart (also supported by Mendix). In this case you would use a helper entity with 2 unlimited string attributes: 1 that contains the data string and 1 that contains the layout string.
You would then add the data in a JSON structure as follow (for the data string): [{“x”: [0, 1, 2, 3, 4, 5], “y”: [1.5, 1, 1.3, 0.7, 0.8, 0.9], “type”: “scatter”}, {“x”: [0, 1, 2, 3, 4, 5], “y”: [1, 0.5, 0.7, -1.2, 0.3, 0.4], “type”: “bar”}]
You can read more here: Any Chart Widgets | Mendix Documentation
Hope it helps!