Export JSON from the GSoC dashbaord. When signed in as an org admin, for 2019, it's this URL: https://summerofcode.withgoogle.com/api/om/program/2019/proposal/?ignored=false&is_complete=true&order=title_lower&page=1&page_size=50&shared_with_org_members=true
Paste it into the script.js file.
To run the script, navigate to the directory where the script is stored, e.g.
cd downloads
node script.js > proposals.txt
Assuming you have node installed, this will create a file called proposals.txt with the entries from the json formatted as csv, ready to be pasted into a spreadsheet.