R - How to update Vader Lexicon scores?

Question

I like to update the VADER sentiment analysis package with new words/ scoring. However, as i am using R i have difficulties to translate this code:

I saw here how this works for python: Python - How to update Vader Lexicon scores?

The update of the word "moon" in python:

SIA.lexicon.update({'moon': 5})

gives in R the error that the function "SIA.lexicon.update" could not be found.

Any idea how i can use this in R?

Thanks and best regards