Migrate contact selection to Dbus
There is, in fact, a way to communicate contacts with the systems: com.jolla.contacts.ui
on Dbus https://together.jolla.com/question/175189/how-to-correctly-insert-contacts/
https://sailfishos.org/wiki/Contacts is also relevant, as is this post on the forum, wherein such an interface has been specifically requested.
Edited by Ruben De Smet