Sure. Create json structure, input mappings, and microflows to import the data. I think the quickest way to include the Json is to create a string variable in your microflow and copy the Json into that variable.
Then, create a microflow that checks to see if the data has been uploaded and, if not calls the microflows that load the data. Specify this microflow as your after startup microflow in the project configuration page.
FYI, this how to has the details about how to import json into your Mendix app. You can ignore the part of this how to that involves calling the rest service https://docs.mendix.com/howto/integration/consume-a-rest-service