Combine Basic Auth and Bearer token in nginx reverse proxy

Nginx reverse proxy configuration

upstream frontend {
    server frontend:4200;
}

upstream backend {
    server backend:4000;
}

server {
    listen 80;
    location / {
        auth_basic "Restricted";
        auth_basic_user_file  /etc/nginx/.htpasswd;

        proxy_pass http://frontend;
    }

    location /api {
        rewrite /api/(.*) /$1 break;
        proxy_pass http://backend;
    }
}

I have a nginx which works as a reverse proxy for my app. I use Bearer token for user authentication between frontend and backend. When I set auth_basic in nginx - it's conflicts with my Bearer app auth as nginx could not have 2 Authentication headers. Are there any solutions on how to restrict access to my env and in the meantime continue to use Bearer token in APP? PS: backend is written in NodeJS (NestJS)