How To Create Widget Animation With Pure c++ Using UWidgetAnimation, UMovieScene, UMovieSceneTracks, UMovieSceneSections ETC.

Development Programming & Scripting C++
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If you have a reference to the widget in your C++ you can just set the color / opacity like the following. Code snippet that sets buttons active / inactive in C++.

// color and opacity constants
const FLinearColor ACTIVE_BUTTON_COLOR = FLinearColor(1, 1, 1, 1);
const FLinearColor INACTIVE_BUTTON_COLOR = FLinearColor(1, 1, 1, 0.333f);

UButton* _Button_Tool_01; // need reference to it

// set the color
_Button_Tool_01->SetBackgroundColor(INACTIVE_BUTTON_COLOR);

In your case you would tick a timer and change the color over time.