ImGui-UWP is a UWP backend for Dear ImGui.
ImGui-UWP has been tested against the DirectX 11 and DirectX 12 rendering backends but it should work fine with other rendering backends that are compatible with UWP too (e.g. SDL2).
The examples folder contains C++/WinRT UWP CoreApplication examples for using ImGui-UWP with both DirectX 11 and DirectX 12.