Where is the voice broadcast of vivo X9plus short message set?

Vivo X9plus has no short message voice broadcast, but it has alarm clock voice broadcast. The setting method is as follows:

First, we turn on the "alarm clock" in the mobile phone;

After entering the alarm clock interface, we click the "+"button in the upper right corner;

When the user sets the corresponding alarm clock time and event, turn on the switch of the voice broadcast function below.