Add XMPP to the predefined list of services

[nicfab]

I kindly request that you add the XMPP to the predefined list of services, which should be in the form xmpp:[email protected]/? as for the international standards XEP-0147 and RFC-5122.
Now, adding an XMPP account is impossible because the system automatically replaces xmpp: with mailto: or https:.
I use my XMPP account every day, and it would be great if I could add it to my Linksta.cc instance.