Questions and Answers for Product is the perfect app you need to do it!
This app allows customers to ask questions about specific products, get answers, and view other threads. This app also show your product's questions and answers on product's page.
Update version 1.2.1 (Jul 02,2018):
Update version 1.2 (June 4,2018):
Update version 1.1 (Jan 11,2018):
Developers of Omega Team are very passionate to develop Shopify's solutions for integration. We are trying to develop amazing Shopify's apps for merchants.
You can see all Omega's app.