Pre Populate Composer Fields

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Hi All ,

I have selected meta keywords as one of the default attributes , when they add a new page it is mandatory to fill ,

I want to some of the keywords to be there by default whenever a new page is added ,
I tried adding it with attributes but the value is not shown when they composer is loaded .
but the default values is displayed inside attributes . >> keywords

Any solution to show the keywords when the composer is loaded.