I am currently working on a plugin to export timelines which uses Selenium/Puppeteer and chrome headless. This would be a better solution for the "use the print feature of chrome" to export a timeline, but would require a chrome or chromium-webdriver installation which is around 250MB. This feature was requested multiple times and I think would be a great addition as well as it could replace or extend other print functionality.

But I am not sure if this feature should be integrated into openproject, because of the additional dependencies. If this is not a problem or you see a another solution. I would be happy to implement this feature.