Need some clarity on best way to invoke REST endpoints in VBCS?

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Hi,

I am using a POST endpoint, "formrequest", that I call multiple times to get data that can look completely different depending on the call (different variable names, arrays, etc). I am trying to use the serviceDataProvider, however, because I need to dynamically build my json before calling the REST endpoint I am just wondering the best way to do this? I am not seeing anywhere I can pass in a {body} for my json request to the serviceDataProvider?

Should the goal to be using the Action flows to complete as much as possible? I am just wondering if I should be doing this programatically instead.