To whomsoever it might help, I was able to solve this on my own. The key is to tailor the write commands as per the app designer. For e.g. in the startupFcn(app) :
temp = device(a,'I2CAddress',0x38);
write(temp,0x70,'uint8'); % telling the sensor to write
function startButtonPushed (app,event)
write(temp,0xAC,'uint8'); %writing this hex code to initiate measurement
write(temp,0x71,'uint8'); %telling the sensor that now you're ready to read
v = read(temp,2,'uint32');
Then afterwards as per some bitshifting and stuff you'll be ready to acquire data in real-time.