Add value from Additional Details field to order tag

Hi,

I’m new to using liquid and having some trouble building a Flow that will add a value from the additional details fields on an order as an order tag. I have the Flow set up easily enough but can’t work out what I’d need to add as the code for the tag.

Would anyone have any insights that could help me at all?

Thanks in advance!

(The above ebay australia order id is a dummy number added for reference only)