Filament v4: Adding extra fields on ViewRecord page

/**
     * @param  array<string, mixed>  $data
     * @return array<string, mixed>
     */
    protected function mutateFormDataBeforeFill(array $data): array
    {
        dd('check'); // never gets called
        $semester = Semester::where('is_active', true)->firstOrFail();
        $photo = Photo::where('uin', $data['uinid']);
        $primaryAdvisor = $studentAdvisors->advisors?->primaryAdvisor();
        $data['student_advisor'] = $primaryAdvisor->full_name;
        $data['student_photo'] = $photo->image;
        ....//more fields.
        return $data;
}

public function mount(int|string $record): void
    {
        parent::mount($record);
        $this->mutateFormDataBeforeFill($this->getRecord()->attributesToArray());
    }