You can download and edit the json script for the Scratch project.
- From the "See Inside" screen, File->Download to your computer.
- Rename the file to have a ".zip" extension instead of just ".sb2".
- Unzip the file to edit the "project.json" file.
- Edit the list data under "ListName": "[your list]" as desired.
- Reassemble the zip file
- Remove the ".zip" extension. (Back to ".sb2")
- Update the Scratch project by going to the original project and selecting File->Upload from your computer.
In this sample project I have a list called "Jobs". The project.json file has a section like this...
"listName": "Jobs","contents": ["Accountant","Actor","Advocate","Appraiser","Architect","Baker",...
Make whatever changes you want directly to the section for your list.