I often think of this as a “German” required style, so I searched the forum for that. This is not something that Endnote can automate and there are some threads about creating a label and some output templates.
Here: https://community.endnote.com/t5/EndNote-Styles-Filters-and/Bibliography-Template-Author-in-square-brackets/m-p/6542/highlight/true#M705
and
Here: https://community.endnote.com/t5/EndNote-Styles-Filters-and/Looking-for-a-style-but-I-don-t-know-it-s-name/m-p/11549#M1291
and then a complicated way to perhaps generate the labels, but not sure this ever got resolved:
https://community.endnote.com/t5/EndNote-Styles-Filters-and/Style-needed-Format-Mey09/m-p/7189/highlight/true#M807
I am sure it has been discussed in other threads…