VIRB Edit 3.0.1: export resolution limited ?

Hi. After having imported a 2.7k-60 mp4 clip into VIRB, I did all the needed edits and overlays. Then, when I wanted to export, I noticed that the maximum resolution proposed (3.0.1 on Mac) was HD-14440p (also HD-1080p). Did I miss something or isn't it possible to export at a resolution higher than 1440p ? no 2.7k export ? Thank you in advance