Outline for handtracking hand using passthrough

Development Platform & Builds XR Development
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I am using Unreal5 meta fork version 63.1 to develop a HandTracking MR stand-alone Game.

Everything okay but hand’s outline, I want to implement outline like Quest OS’s system hand outline (video below)

My project has outline material and it is using two-side material like below

image
image2493×1210 376 KB

I set it to my hand’s OverlayMaterial but it didn’t work because hand material’s blend mode is AlphaHoldOut(for rendering passthrough).

How can I implement outline in this case?

(Obviously we cannot use post-process..)

Thanks!