This script was built to quickly build single product ad groups for use in Google Shopping campaigns.
You'll first want to create a new Google Sheets file, adding build-spags.js, interface.js, send-csv.js, and sidebar.html under Tools > Script editor.
After refreshing the page, a new SPAG Builder menu option should appear:
In that menu, select Create Product ID Sheet, which will add a sheet for you to paste your product names and ids in:
The Settings option will open the sidebar, where you will set the necessary parameters for a Google Shopping Campaign:
Once that's filled, choose Run. You can then either copy and paste the output in Google Ads Editor or use the Email CSV option to send yourself a CSV file of the output.