Your best bet is likely to migrate your data to Zotero using this guide, then use one of the options mentioned here and here to bulk create literature notes on all items in a collection or your whole library.
Loosely ranked, these options are:
- Use Zotero Integration and switch to the classic view citation dialog → then press “Multiple sources”. Details here.
- Use Zotlit’s Zotero addon, which lets you select items in the Zotero interface and bulk-create Obsidian notes on them from the context menu
- Use my bulk import script, which uses a bibtex export and Zotero Integration’s runImport API
- The Zotero Sync Client plugin, which by default creates notes on all items in your Zotero library. Just note that since this relies on the Zotero web API, 1) it needs an internet connection and 2) it can’t import image annotations, since Zotero doesn’t sync these, but creates them locally.
If you want a comparison of the Zotero Integration and Zotlit plugins, see this message on Discord.