Hi Clement,
I am not fully sure I get your point, we do not support ES2 import and export any more because for us the format does not appear to be reliable, no official documentation of the recent version used by the only main user, ecoinvent, and the released ES2 files are not fit for an LCA calculation directly in openLCA. Please therefore rely on the files we release, thank you. And I'd be interested to ask, why do you want to use ES2?
Best wishes,
Andreas