Is it possible to use the !include option also for the lovelace resources?
I mean to use a separate file yaml for the list of the resources and use the !include to split the configuration.yaml file?
EDIT: Yes, it is possible… 
Asking for help, then finding a solution without posting the answer is counter productive to the forum. Please post your solution or remove your thread. An ‘empty’ thread like this is frustrating and a waste of users time, when it could be productive or helpful to someone.
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Yes, you’re right, but i think the solution is inside the edit of the message.
BTW i simply used the configuration split option creating a file called lovelace.yaml and puttin lovelace: !include lovelace.yaml inside configuration.yaml.
And to others that stumble on this thread, then learn more about the different include options (around 11 minutes in) and other stuff here.
Or this, if you are like me and prefer text to videos: