You need to Export your H9 Presets (or an entire Preset List) from H9 Control first.
In H90 Control – either the Parameters tab or the Presets tab – look for the 3 vertical dots next to the currently loaded Preset name (on either side). Click on them, and you can navigate and load either of the H9 Preset formats.
Don’t forget to Save To Library, if you’d like.
For entire Preset Lists (or your whole H9 pedal), look at the bottom left of the Parameters tab. Right under your current H90 List, there are 5 icons.
Hover over the middle one, you’ll see Import List. Click on it to Import H9 List.