How to expose/use attachments from json

Hi

I have a workbench looking at a json feed: https://niord.dma.dk/rest/public/v1/messages?lang=dk&domain=niord-nm

The feed contains attachments for some of the features, with a column specifying a link to the location of the attachment (PNG file typically):

I would like to populate a field with this url, so that I can sent it to correxponding features in a SDE database. i tried to use AttributeExposer and AttributeCreator to extract the link to a new coloumn, but this seems impossible as the coloumns with the attachment information is not available in the list of attributes to expose/create (should be between areas and charts):

How can I extract the information from attachments coloumns to an attribute in FME then?

Here is an example of one of the attachment files:

https://niord.dma.dk/rest/repo/file/messages/e/f0/ef03d235-70af-44e9-8a20-8c506534abfe/80/Overview%20with%20national%20measures_5.png