Graph with 15 minute resolution from hourly measured values

Hi all,

I have a current sensor on my electricity meter. This sensor measures the meter reading every 15 minutes and then transmits all 4x 15-minute readings in different variables once an hour.
I would now like to display these values in a common graph so that I have a resolution of 15 minutes.

Unfortunately, I have no idea how to solve this. Do any of you have an idea/solution?

Thank you very much!