MQTT Cover reverse

Hello,

i’m struggling with the config of my mqtt cover.

My covers are controlled from FHEM. There closed at 100 and opened at 0.
I used some slilders there to set the position for some years, so i dont want to reverse that usage.

I managed to get the cover working through mqtt with HA.
But either the position slider is working the wrong way around or the up/down not working correctly at the fully opened or closed position (The wrong one get disabled).

How can i get this working as is want?
THX

mqtt:
  cover:
    - command_topic: "fhem/rollo_Buero/set"
      set_position_topic: "fhem/rollo_Buero/set"
      set_position_template: "{{ position }}"
      position_template: "{{100 - (value | int) }}"
      name: "Rollo Büro"
      position_topic: "fhem/rollo_Buero/position"
      payload_open: "up"
      payload_close: "down"
      payload_stop: "stop"
      position_open: 0
      position_closed: 100
      unique_id: d926f715-cc0c-4c87-8756-716e7258683e

Found a workaround.
It is possible to enable the up/down buttons all the time.
https://community.home-assistant.io/t/cover-button-open-close-unavailable/184614/5
This is ok forme so far.

It would be nice, when there is a setting to reverse all the handling.

BR