Macro / Scripting command to import labels

**Is your feature request related to a problem? Please describe.**
"[File menu > Import > Labels](https://manual.audacityteam.org/man/importing_and_exporting_labels.html)" is not available for macros or scripting.

**Describe the solution you'd like**
A macro / scripting command similar to "[Import2:](https://manual.audacityteam.org/man/extra_menu_scriptables_ii.html#import)" but for label text files.

**Describe alternatives you've considered**
Reading the file in Nyquist, parsing the file, and generating the labels with Nyquist. This can be done, but it is a much more complicated task and is only available for ;analyze type plug-ins. For ;tools type plug-ins the labels would need to be created one at a time using "AddLabel:" followed by "SetLabel:", which is both complicated and slow.

**Additional context**
The "[ImportLabels:](https://manual.audacityteam.org/man/file_menu_import.html#labels)" is unsuitable for batch processing or automation because it requires user interaction to select the file to be imported.