When you have completed and saved your project, delete all but the text overlay files.
Then click the 3-lined 'hamburger' menu at the top-left of the VP window, click FILE and SAVE PROJECT AS. Give it a name like "text_overlays."
Next project, click the FILE menu and IMPORT FILES FROM ANOTHER PROJECT - choosing the "text_overlays" VPJ file.
The text files will appear under IMAGES tab in the bin, ready to be dropped into that new project.