To directly link and open an email app or call a phone number, you can simply do the following. When editing a content page, select the "External Link" button shown.
Then enter the following for phone or email respectively:
For phone number direct dial -> tel:1234
For email to -> mailto:firstname.lastname@example.org
Replace accordingly with your email address or phone number.
After that, the shortcut will appear as a button and can then be tapped directly within the app: