Are you logging the real time value in value Stream? If yes, you can use QueryPropertyHistory or QueryNamedPropertyHistory or QueryNumberPropertyHistory to get the infotable values.
I hope it helps.
lets consider you have Data table 'X' thing then You can just make a value stream 'Y'-> map 'Y' to the respective 'X' data table thing, -> value stream 'Y' consist of subscription-> add new subscription with thing 'X' and with change of the property value in 'X' call service to add data table entry's and get datatable entry's -> map this to your time series chart. you can watch this video to understand value stream https://community.thingworx.com/videos/1467