How do I remove the default value defined by the dto property in the @nestjs/swagger PartialType function?

CreateAdminDto.ts

export class CreateAdminDto {
  readonly username!: string;

  @IsOptional()
  readonly jurisdiction?: string | null = null;


  @IsOptional()
  readonly nickname?: string;
}

UpdateAdminDto.ts

export class UpdateAdminDto extends PartialType(OmitType(CreateAdminDto, ['username'])) {}

In CreateAdminDto, I defined a jurisdiction attribute and set the default value. In UpdateAdminDto, I used @nestjs/swagger PartialType function, and when I update, I don’t pass the jurisdiction attribute, but it does have a default value. How do I remove this default value?