Hello @Yan Gu - MSFT . Surprisingly there is such thing (currently). The Xabre xamarin-bluetooth-le Service Release for 2.1.0 does not support UWP, however the pre-release 2.2.0-pre2 does. Quite powerful too, all functionalities of BLE comm are functional across all 3 platforms.
https://github.com/xabre/xamarin-bluetooth-le/releases