Different Animation Interpolation

Is there a way to change how the eyes blink without changing the anim interpolation to step? I animated the scale of an eyes in Blender where I have changed the keyframe interpolation to Constant witch works fine, but it looks like everything is converted to Bezier/linear in unreal engine.

For example, can I change the interpolation only for a single bone?

My goal is to make blinking eyes, so if you have any other solution for this, please let me know. Thanks!

I figured out it’s better to do that using shape keys/morph targets

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