Updating htaccess file with new contents gives errors - apache

Question

I need to make a certain configuration to my apache in order to utilize a certain npm package https://github.com/tlaverdure/laravel-echo-server over cpanel. So I was wondering if it is possible to safely add the follow code to an existing .htacess file.
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/socket.io [NC]
RewriteCond %{QUERY_STRING} transport=websocket [NC]
RewriteRule /(.*) ws://localhost:6001/$1 [P,L]
ProxyPass /socket.io http://localhost:6001/socket.io
ProxyPassReverse /socket.io http://localhost:6001/socket.io
Here are the contents of the .htaccess file:
RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301,NE]
<IfModule mod_rewrite.c>
<IfModule mod_negotiation.c>
Options -MultiViews -Indexes
</IfModule>
RewriteEngine On
# Handle Authorization Header
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
# Redirect Trailing Slashes If Not A Folder...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} (.+)/$
RewriteRule ^ %1 [L,R=301]
# Send Requests To Front Controller...
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]
</IfModule>
# php -- BEGIN cPanel-generated handler, do not edit
# Set the “ea-php74” package as the default “PHP” programming language.
<IfModule mime_module>
AddHandler application/x-httpd-ea-php74 .php .php7 .phtml
</IfModule>
# php -- END cPanel-generated handler, do not edit
EDIT:
I do not have root access to place it within my /etc/httpd/conf/httpd.conf as a virtualhost.

Answer 1

I was able to resolve my problem by placing this within my .htaccess
RewriteEngine On
RewriteCond %{HTTP_HOST} ^(www\.)?sub.domain\.com
RewriteRule ^socket.io/? http://localhost:6001/socket.io [R=301,L]