You can full well deploy docker stacks using ansible. This is what I used to do for rocket.chat: [1] [2] (ditched it for Matrix/element without Docker, but the concept stays valid)

I’m not to the point where the specifics of every system is in Ansible yet.

What I suggest is writing a playbook that list the roles attached to your servers, even if the roles actually do nothing:

# playbook.yml
- hosts: myhomeserver.example.org
  roles:
    - debian-base
    - docker
    - application-x
    - service-y

- hosts: mydevserver.example.org
    - debian-base
    - application-z

# roles/application-x/tasks/main.yml
- name: setup application-x
  debug:
    msg: "TODO This will one day deploy application-x. For now the setup is entirely manual and documented in roles/application-x/README.md"

# roles/application-x/tasks/main.yml
- name: setup service-y
  debug:
    msg: "TODO This will one day deploy service-y. For now the setup is entirely manual and documented in roles/service-y/README.md"

#...

This is a good start for a config management/automated deployment system. At least you will have an inventory of hosts and what's running on them. Work your way from there, over time progressively convert your manual install/configuration steps to automated procedures. There are a few steps that even I didn't automate (like configuring LDAP authentication for Nextcloud), but they are documented in the relevant role README [3]