Converting PyTorch transforms.compose method into Keras

Question

I understand that we use transforms.compose to transform images via torch.transforms. I want to do the same in Keras and spending hours on internet I couldnt get how to write a method in keras that can do the same. Below is the Torch way:

# preprocessing
data_transform = transforms.Compose([
   transforms.ToTensor(),
   transforms.Normalize(mean=[.5], std=[.5])
])

Can someone please point me in the right direction.