How to get historical ESG scores of ETFs on Bloomberg or Refinitiv?

Hello,

I am currently writing my dissertation on ESG investing and want to get the ESG ratings of a list of iShares MSCI ETFs as of December 2019. With my university, I have access to Bloomberg and Refinitiv (LSEG Database), but I can't find historical ESG ratings on any of those two platforms (I am sure that all ETFs existed as of then).

On Refinitiv, if I look up ESG scores I can get the ESG scores of the last 4 quarters (over the last year) but can't manage to go back further in time. On Bloomberg, I only get the current ratings.

Does anyone know how to get that ? whether it is website recommendations or even how to reach this data on LSEG/Bloomberg?

Many thanks!