AdSense Ads In Body/Sidebar

Hey all. I’m searching for a way to include Google AdSense code for ad units (not auto ads) within the body of a post template. It looks like it’s possible to insert this before or after {{content}} for the header/footer of the page but not within the body of the page content unless you do a manual HTML snippet within the post itself.

I’m trying to inject this at the template level somehow, perhaps after the nth paragraph or as a sidebar. But I believe a sidebar would just collapse into the footer on mobile. Any suggestions or ideas?

I’m using the Headline theme.

Appreciate any pointers you can offer. Many thanks!