You can indeed make a line chart with your data. The most feature-rich way to do this is to use the line charts from the Mendix Charts widget package (here). Download the Charts app store module, put the line chart on your page, and then write the microflow to turn the data in your import mapping into the necessary data points to render that chart.
The built-in Mendix ‘Reporting’ widgets won’t work on your Non-persistent entities (without writing Java), so I believe using an app store chart module is the way to go
Here is the reference documentation for the Charts widget to get you started: