You can include your blog posts and other post types in the product search results.
To enable this option go to Catalog Settings > Product Search and check the ‘Include other post types on product search results’ checkbox:
The blog posts and other post types will appear in the product search results. If your blog post or other content contains an image, it will also appear in the search results – the same way as the products.
Filter website content search results
You can filter the search results with the Search Content Filter. You can add it to the Product Filters Bar or any other widget area.
Once added it will show the radio buttons to filter the search results: