How do you customise these 3 dots in wagtail?

i want to add another option in it which is send Email, which will send email to all the subscribers

class FeaturedPageViewSet(SnippetViewSet):
    model = FeaturedPages
    menu_label = "Featured Pages"
    menu_icon = "grip"
    menu_order = 290
    add_to_settings_menu = False
    exclude_from_explorer = False
    list_display = ("blog", "workshop", "ignore")
    search_fields = ("blog", "workshop", "ignore")
    list_filter = ("ignore",)```
(https://i.sstatic.net/fzKv5gM6.png)

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