Create a chart using categorical data

Hi, I have some categorical data tuples that look like that: [date, int, text]

I would like to have on the X-Axis the date and on the Y axis the int. However, I do not want my users to see the cryptic int but the text instead

WHY I want this? Because the text is some categorical data (absent,low, medium, high) and I transformed the data into integers so I can compare them to show on the chart how the values change over time. The int is just a discrete number that I gave to those text categories.

Does someone know if there is a plugin doing that or how I could handle this?