Control Xiaomi Smart Device on Apple Home

Install Home Assistant on Synoloy NAS

Install “Docker” package on your Synology NAS
Launch Docker-app and move to “Registry”-section
Find “homeassistant/home-assistant” within registry and click on “Download”. Choose the "latest" tag.
Wait for some time until your NAS has pulled the image
Move to the “Image”-section of the Docker-app
Click on “Launch”
Within “Network” select “Use same network as Docker Host” and click Next
Choose a container-name you want (e.g., “homeassistant”)
Set “Enable auto-restart” if you like
Click on “Advanced Settings”. To ensure that Home Assistant displays the correct timezone go to the “Environment” tab and click the plus sign then add variable = TZ & value = Europe/London choosing your correct timezone. Click Save to exit Advanced Settings.
Click Next
Within “Volume Settings” click on “Add Folder” and choose either an existing folder or add a new folder (e.g. in “docker” shared folder, add new folder named “homeassistant” and then within that new folder add another new folder “config”), then click Select. Then edit the “mount path” to be “/config”. This configures where Home Assistant will store configs and logs.
Ensure “Run this container after the wizard is finished” is checked and click Done.
Your Home Assistant within Docker should now run and will serve the web interface from port 8123 on your Docker host (this will be your Synology NAS IP address - for example http://192.168.1.10:8123)

Install the latest release of HACS.
Create a new folder named /custom_components under your home assistant install path like /docker/homeassistant/. This will be your plugin directory.
Upload the .zip package to the directory and unzip it here with a single directory like /docker/homeassistant/custom_components/hacs/.
Restart the homeassistant Container on Synoloy Docker Manager.
Relogin to the HA dashboard.
Search and install HACS on Configuration-Integration with your GitHub account.

Restart the HA on Configuration-Service Control-Restart.
Search and install Xiaomi mioT or Xiaomi Auto.
Scan device via Xiaomi account or local network scanning.
Restart the HA again on Configuration-Service Control-Restart.
Config Xiaomi Auto by adding device one by one which would be much more clear for you to control each of them if you have many devices.

Install Homekit-Bridge on HA Integration.
Using your iPhone Home APP scan the QR code appear on new message after you added Homekit-Bridge to add HA as a bridge between Xiaomi devices and Apple Home.
Add automations as you want in your Home APP.
By the way, there should be a homepod(mini) or ipad to control your smart device remotely as a local server and run automation. Or you only could control them when you are in the same network with them.