structurizr.scripting when viewing the documentation page.
Paid plans only
The following functions are provided for paid plans only.
exportDocumentationToOfflineHTMLPage(callback): Exports the currently loaded documentation to a single HTML page for offline use. The callback function is called when generation of the HTML page has been finished, and the first function argument is the resulting HTML markup.
The diagram scripting API can be used in conjunction with tools such as Puppeteer (headless Chrome/Chromium), to automate the export of documentation from the command line, perhaps as a part of a build process. The structurizr-puppeteer repo on GitHub has some code samples of how to do this.