No, FAQs is not significant to add on Blogger Post but if you want to take SEO advantages you should .

frequently asked question, frequently asked questions —used to refer to a list of answers to typical questions that users of a Web site might ask.

Schema.org (often called Schema) is a semantic vocabulary of tags (or microdata) that you can add to your HTML to improve the way search engines read and represent your page in SERPs.

According to John Mueller – Webmaster Trends Analyst at Google, JSON-LD Markup is better as most of the new structured data tool support this.