In KDE4 I could start an application from systemsettings by creating a .desktop file in /usr/share/kde4/services:

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[Desktop Entry]
Type=Service
Icon=myapplication
Exec=myapplication

X-KDE-ServiceTypes=SystemSettingsExternalApp
X-KDE-System-Settings-Parent-Category=system-administration
X-KDE-System-Settings-Parent-Category-V2=system-administration
X-KDE-ParentApp=myapplication
Categories=Qt;KDE;X-KDE-settings-system-administration;

Name=My Application

I guess that I need to create a .desktop file in /usr/share/kservices5 but I haven't found out how to configure the file.

Does anybody know how to do this?

It should be (exactly) the same, just that it has to be in /usr/share/kservices5.

One thing though:

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X-KDE-System-Settings-Parent-Category=system-administration

AFAIK the "system-administration" category has been removed some time ago.
Choose something else or your entry won't show up.
(although all those categories are by itself defined by files in /usr/share/kservices5/, the list is not static and you could even add your own)

Here's some documentation:
https://techbase.kde.org/Development/Tu ... sktop_file
The command to get a list of all available (top-level) categories is this now though:

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ktraderclient5 --servicetype SystemSettingsCategory --constraint "[X-KDE-System-Settings-Parent-Category] == ''" | grep DesktopEntryName

You could of course also look at the other files that are already there...