Endnote can’t “parse” plain text into records. If you do have scopus subscription, you can select and import them from there.
If you have access to a database, it may be far easier to download them than to try to manipulate a plain test set. You don’t mention your field, but if the sciences, you are best off finding citations you want to use by searches and the connect feature. No reason to have a library of records that you don’t know what is in them.
You can read this old thread for some tools, but not sure if they are still around: https://community.endnote.com/t5/EndNote-How-To/can-endnote-scan-an-old-80-page-word-document-and-import-the/m-p/2685#M857