How would I go about implementing a mobile app that uses a machine learning algorithm on the backend to track a certain metric for the users?

Assuming that the server is already set up and the algorithm is loaded and ready to receive data, all I want to do is send the data from the mobile app (maybe in a JSON format) to the server, perform inference on it, produce a calculation for the target variable, and then adjust a value that is tracked in the user’s information back on the phone. So what would be a good way to go about this?

Apologies if the question is amateurish but I’m not familiar with mobile app development.