embed custom schema code into every page

I have a small set of pages (less than 25) that I’d like to put schema seo code into. I’ve tried a few plugins and they all seem to do one particular thing but don’t address items for my specific service. How can i put a block of code on every Page (i’m not using Posts, just Pages)? Each page, of course, is unique in content and type of service.

I tried using a text block not in Visual editor and it continues to make this code visible to the frontend