MudNavGroup - change Title style

I want to change the style of the Title of a MudNavGroup and only the Title.

I tried with the Style Attribute but it change the style of all the element in the ChildContent

<MudNavGroup Title="@item.Group.GroupName" Expanded="true"                 Style="background-color:aqua; font-size:medium">

My question is the following, how can i modify the style of the MudNavMenu without affecting the MudNavLink