import: support importing resources into nested stacks

[saltman424]

Describe the feature

I would like to be able to import into the nested stack in the following structure:

Stack
  NestedStack
    ResourceToImport

Use Case

I have nested stacks with resources that need to be imported

Proposed Solution

I am not familiar with all the implementation details of import but some options that come to mind are:

• Treat nested stacks like root stacks in that you can select them for import (e.g. cdk import MyStack/MyNestedStack)
• When import is run on a root stack, it is recursively ran on all nested stacks under that stack

Other Information

The implementation of this feature may have some interplay with the implementation of #20917 since both have to do with the selection and processing of stacks for import

Acknowledgements

• [ ] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

CDK version used

2.29.1

Environment details (OS name and version, etc.)

Windows 10 Enterprise Version 10.0.19044

[jaklan]

Is there any progress on that one?