It doesn't need any more, when export BOM, you can chose which attribute as you want

@UserSupport I see, thank you, but the problem is that for my already existed projects with "In BOM" attributes previously added to some components , if I add attribute with the same name for new components then it doesn't show value in the Export BOM, because it seems decides that it is two different columns but it shows only initial one and doesn't seconds one and doesn't add values from the seconds one into the column.