Please follow the steps below to display products list on blog article page.

Step 1 : From your shopify store admin > Click Settings > Metafields and metaobjects > Blog posts

Step 2 : Click on “Add definition” button and add data as below

Name: Related Products
Namespace and Key: custom.related_products (Must be same to same)
Select Content type: Products ( Select “List of products” )

Select List of products and save.

Step 3 : Now go to blog post page, scroll down to “Metafields” and Click on Show all link

Step 4 : Click on Related Products field in open page > select products > select product you like to display in page then click on save button.

Step 5 : Save article page and check page from front side.