How to add different size chart for each product?
Go to Store Admin –> Settings –> Metafields –> Click Products
Click on “Add definition” and add data as below
Name: Size Chart
Namespace and Key: meta.sizechart
Content type:Text ( Select Multi-line text )
Now go to your products and Scroll down to “Metafields” and Add data in Size chart field
If you don’t add data here, global data will appear in page (same data for all products). You can read this above in Product Tabs section.