How to use the @delon/util._Validators.mobile function in @delon/util

ngOnInit(): void {
        this.form = this.fb.group({
            username: [null, [Validators.required]],
            realname: [null, [Validators.required]],
            mobile: [null, Validators.compose([Validators.required, _Validators.mobile])],
            profile: [null, [Validators.required]],
            avatar: [null, [Validators.required]],
            status: [1, [Validators.min(1), Validators.max(2)]],
        });
    }