Is there api call where User can append value on to pre existing metadata template
for example lets say I have metadata template called author and has dropdown of [bob, bill, mary , mark] but i want to push "dan" to the dropdown so the dropdown will be [bob, bill, mary , mark , dan]
OR
Is there a api call that allows for creating new metadata template?
I have looked for documents but most of them were creating metadata on to file with the existing template