I think you should use Binary load in data load editor.
The binary statement is used for loading the data from another Qlik Sense app or QlikView 11.2 or earlier
document, including section access data." - Script Syntax and Chart Functions Qlik Sense 1.1
I hope this helps!
Thanks for the reply, had another query, in our project we are trying to follow a model where we have one app which can be used by different clients, we realized this can be done by creating different streams with required security access for each client. We also found that we can publish this app to a stream, what we are not able to figure out and need help with is how to publish the same app across different streams, right now we are having to take duplicates of the apps and publish to different streams which is not ideal.