ApexCharts tooltip not showing string values

’m working with an ApexCharts line chart that currently displays 4 series with numeric values on the Y‑axis (against dates on the X‑axis). In addition, I have one more series where the Y‑axis values are strings (also plotted against dates).

The issue I’m facing is that the tooltip does not display for the series with string values on the Y‑axis. The numeric series tooltips work fine, but the string series is skipped.

Could anyone guide me on how to configure the chart so that the tooltip element also shows the string values for this series?

Thanks in advance!