Sally I had to tweak a couple of things (like make my attribute an object so it can have a default rgba). That aside your answer was correct and it solved my issue! :)

Hmmmmm.... still blank I think this might be more to do with my attribute how do I point to the p tags in caption? content: { type: 'array', source: 'html', multiline: 'p', selector: 'p', },

Ok so how do I call the current author using core/data ?

For display I would rather the block only get this information rather than have a user pick it that way it's controlled from wp itself. So if i create the block it gets the name and bio of the post author of the post but if I change it from the post edit screen it updates to the new author if that makes sense.