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https://chrome.dev/web-ai-demos/summarization-api-playground...
and you can watch it generate the output token by token in the Event Logs:
chrome://on-device-internals/
..will tell you everything you need to know - including model state, file path, device capabilities, etc.
And there's a single button to uninstall the model.
There is also the ability to load a model from a central location, as suggested by another commenter here, although I haven't tested it yet.
The official chrome.dev Prompt API Playground linked in the thread doesn't work.
Chatgpt made a me tiny chrome extension to test the prompt and summariser api's when they announced last year - my laptop wasn't capable the time but these newer models are obviously smaller and more efficient, so it has sprung into life.
Full prompt and code is on pastebin `7Ja3ATHZ` if anyone wants to test quickly. It summarises the current page and brainstorms app ideas based on the summary.