Won't serve a dataframe with non numeric data

[kalebr]

I have a dataframe that looks like

                                   0  e
2024-01-10 21:15:13.302000+00:00  61  a
2024-01-10 21:16:13.302000+00:00  25  b
2024-01-10 21:17:13.302000+00:00  21  a
2024-01-10 21:18:13.302000+00:00  37  a
2024-01-10 21:19:13.302000+00:00   0  a

When viewing it in the data explorer in grafana, the columns with the timestamp info and the ints come through and are graphed, however, the data does not show the column (e) with the str data. Should this work?