Hey @erez! Yes I want to access author information during build time 
I ended up opening a new question in the forum with more details. Is that ok going forward? If not I’ll make sure to not do that.
I am not sure what you mean to iterate over the collection with the relation widget? Mainly because it seems in only takes one value to be saved for the field. I am currently looking at possibly getting this info with gatsby-node.js but I am still searching.