trigger base image updates after using az acr import

When importing images from mcr or docker hub I want to be able to trigger base image updates.
Maybe this is already possible, but I failed. Any pointers are appreciated.

Something in the lines of:
1. import an image from an external repository
```
az acr import --name --source docker.io/library/: --image :
```
2. create a task to track image updates
```
task create -n -r -c /dev/null -t :
```

Thanks,
Stijn