Please add the ability to use a custom brush instead of the built-in smudge tool in the iPad version of Photoshop

Please add the ability to use a custom brush instead of the built-in smudge tool in the iPad version of Photoshop, since this is currently only possible in the desktop version. My entire drawing process literally depends on this tool, and it would be incredible if it were available on the iPad. Photoshop is by far the best drawing app I’ve ever used, and I wouldn’t want to give it up just because of the lack of customization options on the iPad.  Currently, only one basic version of the "smudge tool" is available for the iPad. In the desktop version, you can add your own smudge tool, customize it yourself, or choose a downloaded one. In my opinion, this would greatly increase the popularity of Photoshop on the iPad among artists, because the basic smudge tool is very awkward to use for "sculpting" a drawing (