change buzzer sound
### Describe the feature request

This plugin is great!  I was looking to see if I could change the tone of the chime buzzer button to be something shorter so I could tie the button into an automation to have the speaker alert whenever someone opens a door.

### Describe the proposed solution

ability to add custom sounds for the two buttons for the chime speaker.

### Describe alternatives you have considered to the enhancement

I could get another speaker, but was hoping to use the doorbell speaker and the existing buttons in the plugin.