Import List plugin can be used to make Metadata entries (as empty books). Then you can drop the book into the proper slot (using MDE).
Calibre has been around over a Decade, and fills the needs of most users as is.
It appears you are trying to convert from a previous method of tracking your old Library. Maybe you can export the metadata to/with an intermediate app, then use CSV with the import list.
OR
Use the CLI tools in a batch to do the lifting.
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