Pre-Defined Instagram size for new IG grid

I have a question regarding available sizes/templates for the IG grid format.

Generally I use standard Adobe apps for content creation but I decided I need to get a bit familiar with Adobe Express as well and potentially start using it for some of my work. To learn, I wanted to create a few Instagram posts since it is my main social media platform.

But right at the bat I have a question regarding the available Instagram sizes. 

IG changed the grid format for the profile earlier this year from square to portrait but for a while you couldn't actually make posts with the proper aspect ratio of 3:4 (and consequently most people used the 4:5 ratio knowing that it would cut off some space on the left and right). However, IG quitely made changes recently and now allows to make posts also in 3:4 aspect ratio so the full post could be seen in the grid properly. Consequently I've changed the format for all my posts to 3:4 as well. 

Does Adobe Express plan on adding the 3:4 format (1080x1440) to its sizes as well? Plus, are there plans to add design templates in that format?

I know I can create a custom size but it's just weird to me that an social media tool wouldn't offer all relevant format sizes. And it would be nice to have a few templates in that aspect ratio as well since it is sort of the replacement of the square post.