Options page in new Firefix WebExtensions API

Is there a way to write addon options page in new Firefix WebExtensions API?

For example, Google Chrome supports manifest key [“options_page”][1]

I searched through documentation and wiki but can’t find anything on this point.
[1]: https://developer.chrome.com/extensions/options

Will be any kind of analogue for preferences in package.json or options_page in Google Chrome manifest.json?

WebExtensions has an options_page manifest property. This is considered deprecated, and the new options_ui property is preferred. Firefox supports neither at the moment, but there are tracking bugs for them:
https://bugzilla.mozilla.org/show_bug.cgi?id=1212684
https://bugzilla.mozilla.org/show_bug.cgi?id=1212685

Behaviour might not be exactly as it is in Chrome, but the idea as with all the APIs is to maintain compatibility of the interfaces. There is some discussion in the bugs about how that API might be presented in Firefox.

Thanks!