There 2 ways
first roadmap showing what Epic is doing or considering and you can place votes on hat you most interested in this way they know about demends so they can set priorities. Epic sets what is there
2nd you can post suggestions in feedback section
https://forums.unrealengine.com/forumdisplay.php?24-Feedback-for-Epic
But check first of it not already in roadmap and it’s recomanded to make a Yes/Maybe/No poll with it