The AceJump shortcuts are configurable under Settings | Keymap | 🔍 "AceJump", where you can add key bindings for specific modes. This is covered in the configuration instructions. Please let us know if this should be improved somehow.

yep, didn't know that... maybe the only thing missing is "DeclarationMode" (Navigate To)
?

Declaration Mode / Navigate To is already supported, although not visible in the above screenshot. There is no default keyboard shortcut but you can select one manually by selecting Preferences | Keymap | 🔍 "Start in Declaration Mode". I will adjust the description so the Declaration Mode action keymap is visible by default in the search results.