I have updated Tab-Labelizer to include showing the drive label. You will need version 1.4.3 from here Tab-Labelizer - Extend the folder names shown in your tabs.
This feature is not enabled by default, but you only need to enabled it.
- Install version 1.4.3
- Open Preferences / Toolbars / Scripts
- Click on Tab-Labelizer
- Double click ExtendedConfig
- Look for showDriveLabel change to true
- should look like
"showDriveLabel": true,
- should look like