You can use the different ways Mendix provide to load data: via Excel, CSV, SOAP or REST. Here you can find how to consume a REST service: https://docs.mendix.com/howto/integration/consume-a-rest-service.
Hope this helps ;-)
Qlik does not provide an easy way to expose the data from Qlik to another application. We have developed a custom component to configure REST webservices to easily get the data from Qlik. We also use that for our customers to get data from Qlik to Mendix. See https://ddcgroup.com/qlik-data-extractor