Teams: Website App Restrictions?

Hi, sorry if this has been discussed before but I couldn't find anything related via searching.

Is there a way to lock down the Website app in Teams to only allow certain web sites, or a specific web site? I realize a user could simply access the web site in their browser, but our org has very strict regulations on app integrations like this.

Short of writing our own App, are there any options for adding restrictions to the existing app?

Regards,

H