I did customize a shortcut for restarting the kernel with

{
  "key": "0 0",
  "command": "jupyter.notebookeditor.restartkernel",
  "when": "notebookEditorFocused && !inputFocus"
}

But I don't see a command to interrupt the kernel.

Apologies for the delay, the command for interrupting kernels is jupyter.notebookeditor.interruptkernel & jupyter.interruptkernel for Notebooks and Interactive window, respectively.

Thanks! Not sure how I missed seeing those in the list of commands.

I added the "interrupt kernel" shortcut in pull request #10. These shortcuts match what is used by JupyterLab.

{
  "key": "0 0",
  "when": "notebookEditorFocused && !inputFocus",
  "command": "jupyter.notebookeditor.restartkernel"
},
{
  "key": "i i",
  "when": "notebookEditorFocused && !inputFocus",
  "command": "jupyter.notebookeditor.interruptkernel"
}

Useful !
Came to this repo to ask exactly this. Thanks for suggesting. I hope it will be implemented soon

FYI for anyone else who comes here...it looks like something changed in the extension. I had to update my keybindings

{
    "key": "0 0",
    "when": "notebookEditorFocused && !inputFocus",
    "command": "jupyter.restartkernel"
},
{
    "key": "i i",
    "when": "notebookEditorFocused && !inputFocus",
    "command": "jupyter.interruptkernel"
}