How can I set a product metafield to be a file reference (image) using graphQL?

Shopify Partner
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How to get from here to there?


I have a few images that I need to attach to a product but not be visible as product image.   I would like to use a metafield with the type file_reference.  I see how to read it out, but not how to set it.  As I understand, I need the mediaImage id to set its value.   I can do a staged upload but how do I get from there to a gid for the image?


It should be going into something like this ...


Thanks! and best regards jb


metafield(namespace: "xxx", key: "yyy") {
   reference {
     ... on MediaImage {
       image {



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