Is there anyway to add the custom HTML/Script in the head tag on static pages via any application?

I want to add my custom script tag / html code in the head tag to all the static pages. I can manually add my script to the static pages, but i have more than 10,000+ static web pages, so if I were to start editing my code it will be so much time consuming. I want to know is there application out there which can help me to achieve this result. I tried cloudflare which is best for custom apps but I didn't find any app which will allow me to add custom script to my head tag. Anyway to add script automatically?

Is there any application out there or app that will be automatically add my script to the head tags on my live website pages? I prefer adding on live website.

Thanks