Add Option to Mask with Gradient

Masking with gradient is a fundamental feature and is available in very basic video editing apps even of mobile like VN Video Editor. And this is nothing new. We do masking with gradients in Photoshop and Illustrator. Then why this feature or any similar feature like this is not available in Premiere Pro?

I request to include this feature as it would greatly enhance the user experience with Premiere Pro for many of us.
Thanks and regards.