Thanks for your explanation. I appreciate it. Have a great dayUnfortunately, with a Smart Campaign, it is not possible to target custom audiences or any audience segments. The point of Smart Campaigns is to allow Google control over targeting, bidding, and ads.
If you want to target these custom audiences, they are only available on Display, Discovery, Gmail, and Video campaigns, per this Google help article. You can add your GMB as a location extension to these campaigns, but they will not show in Google maps.