Not sure what the expectation is of a standard “wappler way”, but I manage this through a dmx-bind:url. This way you can have builds pointing to different targets (dev/staging/prod).
<dmx-serverconnect credentials="" id="current_member_seen" url="https://staging.mealproapp.io/api/1/3/members/current_member_seen" site="Meal Planner Pro" dmx-bind:url="base_url.value + api_path.value + '/members/current_member_seen'" noload></dmx-serverconnect>
If you are not versioning your api, then you can skip over the api_path.value and just use a base_url variable that sets the domain. That way, you can change the domain in one place and all server connect apis/forms will get that domain.