How to access primvar value from channel

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Hi,
I have a value on the scene graph path that I would like to access from a channel in a wrangle/rop. Is there any way or vexpression I can use to get that procedurally? I know I can copy and paste the value from there or an edit properties node, but I'm trying to call it automatically because it's a number that will change by shot
Thanks!

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Python solution here https://www.sidefx.com/forum/topic/94981/?page=1#post-416460 [www.sidefx.com]
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