Export your view as CSV and match your columns to Glasp's. It takes about two minutes and does not touch your base.
You need columns for the page URL, the title, and the highlighted text — named anything.
Drag & drop your CSV file, or click to select
Imported highlights use your default color and visibility, from Highlight Settings.
One quote per row and several quotes in one cell both work — if a cell holds several quotes on separate lines, Glasp splits them, and you can turn that off. Nothing leaves your browser until you press Import.