How do I store a changing output of a POST request?

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Hi all!   I am trying to build an app, where the user can provide any kind of data table. I do not know the schema of the table. It will be send to a backend via REST POST and processed in a way that I add n new columns to the table. The result should then be displayed in my app.   How can I store the results of this POST request in mendix? Since I do not know the table header I cannot create entities in the domain model.
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