Does FFR (Fixed Foveated Rendering) supported by Oculus Questuse qualcomm GL extensions?

Oculus SDK 1.37 FFR feature:

	/// <summary>
	/// Gets if tiled-based multi-resolution technique is supported
	/// This feature is only supported on QCOMM-based Android devices
	/// </summary>
	public static bool tiledMultiResSupported
	{
		get
		{
			return OVRPlugin.tiledMultiResSupported;
		}
	}

https://www.khronos.org/registry/OpenGL/extensions/QCOM/QCOM_texture_foveated.txt
https://www.khronos.org/registry/OpenGL/extensions/QCOM/QCOM_framebuffer_foveated.txt

Hi, all
Can someone tell me if Oculus' FFR feature is use an extension of qualcomm GL?
Thanks.