I recommend you to not do this. Because by doing this, your whole website become insecure. Think it like real world, if a Bank secure three walls and left one insecure. What will happen ?

The short answer of your question is yes you can do, but not recommended.

Below are the two reference websites:
https://security.stackexchange.com/questions/71512/is-it-possible-to-force-a-browser-to-use-http-in-an-ssl-enabled-https-website

https://stackoverflow.com/questions/30033191/using-htaccess-to-force-some-pages-using-non-ssl-on-an-ssl-site

RewriteEngine On
RewriteCond %{REQUEST_URI} ^/unsecure [NC]
RewriteCond %{HTTPS} ^on
RewriteRule ^(.*) https://example.com/$1 [R=301,L]

Regards,
TheRightSol