Is there a way to convert subject subscription in a method to return a value

Question

I'm developing an angular application, in which i have a modal dialog with a form with some fields. In one of that i have an async validator to check if a value is just present in the DB calling a BE api.

My need is to trigger validation when i change the input of that field and when i submit the form.

Before the submiting of the form, i need to re-check all the fields, and i have to wait for the async-validator response, before say that the whole form is valid.

I've found a way to make this and it works very well.

    ...
    formSubmitSubject$ = new Subject();
    ...
     ngOnInit() {
     ....
      this.formSubmitSubject$
      .pipe(
        tap(() => this.form.markAsDirty()),
        switchMap(() =>
          this.form.statusChanges.pipe(
            startWith(this.form.status),
            filter((status: string) => status !== 'PENDING'),
            take(1)
          )
        ),
        filter((status: string) => status === 'VALID')
        )
        .subscribe(() => {
          return this.sendRequest();
        });
        ...
      }

      onSubmit() {
          this.formSubmitSubject$.next();
      }
      ....

When i submit the form i can wait for the completion of al the sync/async validators, and then if all the fields in form are valids, submit the form.

Now i need to create a method, inside this component like

    checkFormValidity(): boolean {
        // code
    }

that i can call from an other component, and wait for complete all sync/async validations using the formSubmitSubject$ and return the state of the form.

So, is possible to put the subject.pipe().subscribe() into a method and return the boolean value only when all is resolved?

Thanks in advance!