Translating labels

Sorry if this has been answered before, but I could not find it.

I want to translate the labels for 1) custom taxonomies and 2) custom fields within metaboxes

The goal is when I display them on the frontend via A) get_taxonomy_labels or B) MB frontend submission, to show the translated label for current language.

I have installed Loco Translate but don't see a file showing my custom taxonomies/fields.

Is there a way to do this? The only thing I figured out currently would be to:
- for taxonomies, use a template string instead of get_taxonomy labels
- for custom fields, create different metaboxes for each language, and show them in the post conditionally. This might be okay but doesn't seem very efficient. Is there a simpler way?

Thank you