I’m sorry for the late reply, I suddenly got swamped at work
Thank you, you are correct, it popped up like you said
I realize I hadn’t really thought this through thoroughly enough before asking my initial question, but I think I know what kind of solution I’m looking to create now 
I’ve concluded that I need to find a scripable way to do this as there’s more I would like to do than what I initially stated.
First, I want to be able to specify custom fields/tags (e.g. different named categories to choose from for each specified label), so instead of adding this data to the file-meta I think it’s better to add this metadata to a separate text/json-file instead (containing all information I’d specify for each label), this way I won’t be limited by the available meta-fields for the filetype/format the sound-clips are exported in. I guess I’d need to create a custom window (with predefined categories to choose from) that pops up when a label is created.
Secondth, when the labels are exported I want to automatically perform some other operations on the files (e.g. changing the date modified of the exported files to the date of the source-file which they’re exported from).
I know how to make a gui-prompt/popup (where the meta for each label can be selected) in python, I also know how to change dates etc with python. After looking some more into it I think a combination of using mod-script-pipe (and perhaps pywinauto) might be the direction I’m leaning towards, but I was hoping you could give me another nudge 
If I’ve understood it correctly, when piping through python it isn’t really designed to be “interactive” with Audacity? I know that it’s possible (with mod-script-pipe) to take a project and export all labeled sections, but I’m not sure if it’s possible to somehow trigger a python-prompt directly from Audacity when creating a label?
I’m sorry if I still haven’t been able to convey my goal clearly enough, but to summarize; I have a lot of audio files with conversations about different topics. I want to split these into multiple smaller clips, and I want to specify tags and categories for each of the clips. When I’ve done this each audio-clip will have a textfile (sharing the same filename as the audio-clip files) with the tags/categories that I specified when creating the label(s). If I manage to find a way to do this, I could later create a custom python “browser” that makes it possible to easily search and browse all of my audio-clips based on their corresponding textfile.
Example:
Lets say I have an audio-file with a conversation covering topics of maths, politics, personal health etc. I’ll manually label each section and specify which tags and categories they belong to. When this is exported I will be left with several smaller clips, each with a corresponding textfile (containing information about each clip). This would make it so much easier to find specific parts of conversations that I’d like to revisit in the future.
I’m sorry about the “wall of text”, but I’d really like to find a solution that makes this possible. Any help would be immensely appreciated 