VK.com

VK notifications use simplified message template that has only embed with fields auto-generated fields, but has a template where you can specify additional content.

Additional content template supports a limited set of variables for insertion:

Variable	Type	Description
{{post.url}}	String	Page URL of the post
{{post}}	VkWallPost	Post information

VK subscriptions have additional settings that you can use to only publish posts with specified keywords or specified attachment types.