How to add annotate text example `1st Lockdown, 2nd Lockdown` in Matplotlib like Plotly?

[![enter image description here](https://i.stack.imgur.com/4WDsN.png)](https://i.stack.imgur.com/4WDsN.png)

[![enter image description here](https://i.stack.imgur.com/s8axf.png)](https://i.stack.imgur.com/s8axf.png)