Why are you able to use the !include option in yaml mode, but not if you edit your lovelace view via configure through the GUI?
This would be really helpful especially for custom-cards, that use templating like custom-button-cards. 
Why are you able to use the !include option in yaml mode, but not if you edit your lovelace view via configure through the GUI?
This would be really helpful especially for custom-cards, that use templating like custom-button-cards.