Hi!
First of all, the gantt view it’s a huge and great feature! But… will be great if the subitems could appear as child tasks of the items.
Also, please add top the roadmap different types of dependencies, with the new Gantt view this feature will be a must have for all planners and project managers.
Regards 
My name is Mabel, I am in the product team of Adaptavist, a software development company and a partner of Monday. Great to meet you, albeit virtually!
We’re conducting interviews to increase our understanding of your pain points and needs seeing Subitems in Gantt view. As active user of Monday, your experience is invaluable to us, and your feedback can help us shape a solution for you 
Would you be up for a 30-min chat over Zoom? In exchange, you’ll receive a $50 gift card as a thank-you for participating.
Please click here to schedule our chat : We'd love to hear everything about your needs of subitems in Gantt view | User Interviews
Or you can reach me out here or at mhernandez@adaptavist.com. Thank you!
Hello, I’m wondering if there was any update on this development? Would be super useful as we’ve been grouping our projects as subitems with the tasks as subitems underneath them which makes the Gantt view unusable. Thanks!