There have been a lot of posts with questions concerning status on XIM APEX support for PlayStation 5. This isn't straight forward and if support is possible you should expect it to take time. Unfortunately, that's all we can report regarding this so far.
There has also been some confusion concerning using a XIM APEX to play PlayStation 4 games on PlayStation 5. This is supported, however, you must connect a PlayStation 4 controller to your XIM APEX to enable this.