You can, here are the rough steps.
In the widget's HTML, make an HTTP GET call to /api/me/settings and parse the response to see the value of dailyDigestFreqOptions. Actually, /api/me/settings will only return a redirection URL, but you can replace that with the URL to your actual username instead /api/user/julian/settings.
Then customize your widget as you see fit... maybe only show the widget if the user has daily digest set to off. Otherwise, show <a href="/me/settings" class="btn btn-primary">Subscribe to Digest</a>
Nice thanks, will try !