Alas, there isn't a way to make it available. I'll make this known for the attention of our Product Team, definitely.
The End of the Line Item's ID in GraphQL e.g gid://shopify/LineItem/123456789 maps to the same line item ID in REST but I can understand how it would be easier to just handle the legacyResourceID if you are transitioning over calls from one API to the other. Hope that at least clears up things!
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