Shopify flow - remove variant barcode with HTTP request

I am currently making a flow, that needs to trigger a update to the variant barcode field.

I am quite sure this is through HTTP request, but i am searching the correct body/query for this action.
Can anyone help?

https://shopify.dev/docs/api/admin-graphql/2023-07/mutations/productVariantUpdate

Can you help with the exact query?

Use this is a guide: https://community.shopify.com/post/2090245

Not really, i need the query for changing the Barcode or clearing the barcode.

If you could just sent it here, i would imagine i am not the only one that would benefit from it.