Label + Taxonomy

**Is your feature request related to a problem? Please describe.**
I am trying to annotate documents using label studio. My goal is to select a label and highlight text belonging to that label which is easily done by any NLP labeling template in LS. However, my project starts with no labels and I come up with labels while I am reading the document. The taxonomy template only allows me to create a taxonomy, not highlight text spans.

**Describe the solution you'd like**
I want to generate label tags based on the taxonomy so that I can highlight text spans for all choices in the taxonomy.

**Describe alternatives you've considered**
I have tried adding comments for text spans as an alternate to dynamic labels. However, I have to add a comment every time.