Authenticating a Web Application Using JSON Web Token

Question

Suppose I am not using any front-end or back-end framework to generate any markups on the front-end of my web app but I am using a Web API for authentication purposes, how should I use JWT for authentication purposes? I have done some online searches on securing JWT and found the following :
1 - Store JWT in HttpOnly cookie
2 - Use HTTPs instead of regular
3 - use --Host prefix on cookies
4 - Set SameSite attribute
5 - Encrypt and sign the cookie value with the server secret

The problem is I have not seen any article talk about how to actually use JWTs once they are created and stored in HttpOnly cookies.
The questions I have are the following, (if I'm not using any framework):
1 - How do I use JWT on the front-end if it cannot be accessed by javascript?
2 - How do I persist JWT on the front-end if I don't want users to keep logging in after they leave/refresh a page?