Understand the request! No, it is not available via any API features I'm afraid.
When we consider providing APIs of this kind, we need to look very closely at potential abuse vectors as well as a range of other options (i.e. there's both a create tags path, and then the need to expose additional metadata in the Tweet objects, for example), so this isn't something that we've yet been able to prioritise.
Thanks for your understanding, and apologies to not be able to resolve this for you at this time.