Hello,
Thank you for contacting the support and sorry for any inconvenience that might have been caused due to that.
I’m really sorry, I couldn’t understand this part of the question “In earlier days we moved our whole content to Raw HTML format“. I tried adding Custom HTML widget in Gutenberg post and added all the HTML content to it, Rank Math could read and update the SEO score accordingly. 
If you can share some screenshots that would be helpful for us to understand the issue. You can use tools like https://imgur.com/ to share screenshot with us.
Looking forward to helping you. 
Thank you
		
	 
	
	
	
	
 
			
															
					
					
					
						Hello,
						Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
						If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
						Thank you.