Users who do not have a GMC or Shopify product feed can manually import a product feed via a CSV file.
They need to:
Go to the Shopping Settings
Click on Import in the Import CSV section
Select the CSV file and click Open
If the file is valid, it will be imported, and you can use this feed in the product page widget.
To ensure the file is valid:
It must have a header row with
id;nameEach product ID must be unique
The file must contain fewer than 5,000 rows (this limit can be increased from the back office)