Hi Reaya,
You can definitely add a table inside a collapsible content section on your Shopify product page
Use Below steps:
Go to your Shopify Admin => Online Store => Themes.
Click Customize on your current theme.
In the customization, select Product
In the left sidebar, scroll down and click on the ‘Collapsible row’ block .
In the Content field of that block, you’ll see a basic text editor(‘Row content’).
Click the “Show HTML” icon (<> or {} depending on your version).
And then paste HTML code for Table.
