Service Application for mobile (and TV) web apps should be supported.
This feature is supported in wearable web apps only atm:
We need this for mobile (and TV) messaging web apps, which are often requested by users:
Telegram: https://github.com/zhukov/webogram
Matrix (including IRC, Gitter and webRTC video calls): https://github.com/vector-im/vector-web
Mattermost: https://github.com/mattermost/mattermost-mobile
Rocket Chat: https://github.com/RocketChat/Rocket.Chat
etc...
Thanks