I've recently bought a Canon 200D which has an integrated HDR mode and unfortunately it is quite disappointing: you cannot tune it in any way and the results can only be saved to a JPEG. I've been trying to take sequences manually by switching to TV mode and moving the wheel between each shot, but it's a slow process and shadows/people can change by the time I'm finished.
Is there any way to e.g. write a script that would tell the camera to go ahead and take a sequence of photos with increasing shutter speed? Perhaps some sort of an external device that can send the right signals to the camera?