Automatic proxy configuration URL

Hello,

I´m completely new to Mikrotik and I have no device yet.
Following situation:
I need to configure an automatic proxy configuration URL to log on to a proxy server located on the Internet
I cannot configure the URL within each browser but must make sure that everyone on the LAN is directed to this proxy to authenticate.

Although I think it´s not possible and even kind of stupid to ask I prefer to do so:
Is there any way to get all clients from the interal LAN automatically to this .pac File on the external proxy?

Many thanks in advance