I believe that the Line Widget would be the best to do that.
Widgets does can show a limit of 10.000 data at once.
You can also develop your own custom widget by following this tutorial: Custom Widget (iFrame)
Regarding you not being able to display your data. Would be good if you can paste a screenshot of your live inspector for the device here. That would point us what can be the issue you’re experiencing.
Is not a valid data to TagoIO. If you are being able to store data like this, I’m assuming you’re using MQTT and it is actually storing this information as value of the payload variable.
You will need to normalize this data to TagoIO format, which you can do by using payload parser. Better instructions are available at In-depth guide to Payload Parser