I use Ubuntu with desktop KDE Plasma. (KDE Neon).
When i go to open a file with gravit, this shows the typical Gnome dialog.
Could you add the option for it to open with the KDE dialog box (KDialog)? So users who use KDE Plasma would have greater integration with our desktop.
Also, Kdialog is more complete than the gnome dialog box, admitting file previews, etc., which help a lot to work.
I attach a image of KDE dialog box (KDialog)