How can I add custom entries to "Create New" on KDE Plasma?

I'm using KDE Plasma, and frequently need to package file sets into tar.gz or zip. This usually requires opening Ark, creating a new file, and working from there, which is a run-around. It would be better if I could right-click in the Dolphin workspace for a directory, go the "Create New..." submenu, and pick this file type out; but as of the moment, the only options are: Folder... Text File... LibreOffice Calc/Draw/Impress/Writer... Link to Location/File/Directory/Application... This feels very much like something I should be able to customize, but I unfortunately have no idea where to look for the option. Does anyone know how I can add additional file types to this menu?