HTTPS domain proxying to HTTP app - how to properly make them work together?

I have a domain on AWS EC2 instance with SSL that is served at https://example.com.

The only job for this domain is to proxy traffic from the domain to my home PC which serves a Laravel app. They are connected via WireGuard tunnel.

nginx is used both on the EC2 instance and locally.

This is my config in the EC2 instance:

server {
    server_name example.com www.example.com;
    location / {
        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header Host-Real-IP  $http_host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_pass http://10.10.10.1:80; # WireGuard IP
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}

server {
    if ($host = www.example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    server_name example.com www.example.com;
    listen 80;
    return 404; # managed by Certbot
}

Now when I develop locally the app is not using SSL so the URLs there aren't secured. For example the login page action is http://192.168.100.100/login and not https.

But then when I try to login from the domain and not locally at https://example.com/login, it doesn't work. Nothing happens it just refreshes the page.

So when I set the form action to https, then it works from the domain, but then locally it doesn't work (locally I get 419 page expired, maybe because my app expects the CSRF token but there is issue with the conflicting HTTP/HTTPS?)

How should I make it work in this case? Do you want me to also post my local nginx config as well?

Can I make my app also work locally with SSL? So serving it like https://192.168.100.100? (but then how do I do it)