How to assign ChildContent of a FluentTooltip-derived tooltip?

[Eagle3386]

I set defaults for my app's FluentUI-Blazor components by creating custom ones.
The easy ones are those where it's just @inherits <FluentComponentName> & a couple of parameters via @code { }.

But dealing with FluentTooltip, I struggle with my pursuit of preferring empty / self-closing / standalone tags over "normal" ones.
Because trying this:

@inherits FluentTooltip
@code
{
  // … left out for brevity…
  [Parameter]
  public string Text { get; init; }
  // … left out for brevity…
  protected override async Task OnParametersSetAsync()
  {
    ChildContent ??= @<text>@Text</text>;
    // Doesn't work either: ChildContent ??= __builder => @<text>@Text</text>;
    await Task.WhenAll(InvokeAsync(StateHasChanged), base.OnParametersSetAsync());
  }
}

Any help would be greatly appreciated!