WPHeader.json

<script type='application/ld+json'>
	{
		"@context": "http://schema.org/",
		"@type": "WPHeader",
		"headline": "headline-string",
		"@id":"#header",
		"cssSelector": "#header",
		"potentialAction": [
			{
				"@type": "Action",
				"name": "Login",
				"target": "http://domain.com/login"
			},
			{
				"@type": "Action",
				"name": "Sign up",
				"target": "http://domain.com/signup"
			}
		],
		"@graph": 
		[
			{
				"@context": "https://schema.org",
				"@type":"SiteNavigationElement",
				"@id":"#header",
				"name": "Home",
				"url": "https://www.example.com/"
			},
			{
				"@context": "https://schema.org",
				"@type":"SiteNavigationElement",
				"@id":"#header",
				"name": "Products",
				"url": "https://www.example.com/products"
			},
			{
				"@context": "https://schema.org",
				"@type":"SiteNavigationElement",
				"@id":"#header",
				"name": "About",
				"url": "https://www.example.com/about"
			},
			{
				"@context": "https://schema.org",
				"@type":"SiteNavigationElement",
				"@id":"#header",
				"name": "Contact",
				"url": "https://www.example.com/contact"
			}
		]
	}
</script>