Customize "prepopulation" in Django admin [closed]

I currently have a field that is automatically filled in by taking the value of two additional fields in order: team 1 and team two.

I get the following result with this code within the Administrator class corresponding to the Match model:

@admin.register(Match)
class MatchAdmin(admin.ModelAdmin):
    prepopulated_fields = {"fixture": ("team_1", "team_2")}

Currently he puts Team1-Team2, but I need the format to be Team1 vs Team2, it automatically has to be as follows:

That is, the field fixture is autocomplete with the concatenation of the chains team_1 + vs + team_2 , so that for example, team_1 is Brazil and team_2 is Argentina, fixture is autocomplete as Brasil vs Argentina .

Is there any way to get it? How could I do it?