German umlaut keys (ü, ä ...) and Eszett key (ß)

[Cash-coder]

When I try to remap umlaut german keys I get:
german ä": The output_symbol "ä" is not a macro and not a valid keycode-name"

I've tried with key_ä and symbol:ä, not working

logs

1. input-remapper-control --version
   input-remapper 2.0.1 https://github.com/sezanzeb/input-remapper
   python-evdev 1.6.1

2. which linux distro (ubuntu 20.04, manjaro, etc.)
   Fedora release 39 (Thirty Nine)

3. echo $XDG_SESSION_TYPE
   wayland

4. which desktop environment (gnome, plasma, xfce4, etc.)
   gnome + hyprland as window manager

5. sudo ls -l /proc/1/exe
   lrwxrwxrwx. 1 root root 0 Apr 17 21:06 /proc/1/exe -> /usr/lib/systemd/systemd

6. paste the affected preset .json file from ~/.config/input-remapper-2/presets

7. sudo pkill -f input-remapper-service && input-remapper-gtk -d, apply the preset and hit your key. Then share that log.
   21:26:22.208794 30240 GUI DEBUG message_broker.py:76: from controller.py:720: Signal=status_msg: StatusData(ctx_id=5, msg='"Select Word": Macro.add_hold_keys() got an unexpected keyword argument 'LeftShift_L'', tooltip="Macro.add_hold_keys() got an unexpected keyword argument 'LeftShift_L'")
   21:26:22.208978 30240 GUI DEBUG message_broker.py:76: from controller.py:720: Signal=status_msg: StatusData(ctx_id=5, msg='"Select Line": Unknown key "EndShift_L"', tooltip='Unknown key "EndShift_L"')
   21:26:22.209307 30240 GUI DEBUG message_broker.py:76: from controller.py:720: Signal=status_msg: StatusData(ctx_id=5, msg='"german ä": The output_symbol "ä" is not a macro and not a valid keycode-name', tooltip='The output_symbol "ä" is not a macro and not a valid keycode-name')
   21:26:22.209609 30240 GUI DEBUG message_broker.py:76: from data_manager.py:136: Signal=selected_event: InputConfig KEY_A

[maddinpsy]

I managed to get this setting the compose key in system settings to ALT_R.
German Ä can be made with ALT_R + Shift_R + KEY_APOSTROPHE + A
See this post for details: xremap/xremap#120 (comment)