convert htaccess rewrite rule for nginx

Hi, this is my original Apache htaccess rule:

<IfModule mod_rewrite.c>
   RewriteEngine on
   RewriteBase /
   RewriteRule    ^$ myapp/webroot/    [L]
   RewriteRule    (.*) myapp/webroot/$1 [L]
</IfModule>

I managed to get general rewrites working using this line in my nginx server block config:

location / {
root /var/www/example.com/html;
try_files $uri $uri/ /index.php$is_args$args;
}

However, resources located inside the folder “myapp/webroot/” fail to load on my website since they are now called at root level instead of the specified folder in apache.

What do I need to change to make the original folder rewrite rules work in nginx?