Gaze tracking data with MRTK3 -Hololens2

I am trying to export Eye gaze data, (preferably as coordinates relative to a 2D plane placed in front of the user).
The initial and main problem though is that I don’t know how to access said data through Unity.

I have read that I should first of all import

using Microsoft.MixedReality.Toolkit;
using Microsoft.MixedReality.Toolkit.Input;


However, it gives me an error in the second line of code:

Error CS0234 The type or namespace name ‘Input’ does not exist in the namespace ‘Microsoft.MixedReality.Toolkit’ (are you missing an assembly reference?).

I initialized the project with MixedRealityFeatureTool, already importing the MRTK3 libraries (+XRplugin).

Are there any solutions to get the gaze data?

Thank you!