Image properties' ID for the query condition

Hi,

I would like to add a condition from image properties’ ID in this attached query.
By the way, I would like to make this part dynamic. So I don’t want to just input a hard code “mypage_thumbnail” here. I would like to know how to get image properties’ ID dynamically.

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スクリーンショット 2019-12-01 16.24.26.png2696×1578 377 KB

Please let me know how to do it.

Thanks

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