Hi Angie,
you can export individual elements of a database as JSON-LD, also product systems. That works really fine. Ideally, do this already for the latest version of openLCA (backup your database, then update the database - not the backup - in openLCA 2.3). For a migration into a new ecoinvent / SOCA, openLCA 2.3 now guesses best fits, but there is typically some additional work needed. We could support you there if needed. Let us know then.
Best wishes,
Andreas