How to make a form.Field understand that it is now part of a FormGroup?

[gregorbg]

I am playing around with the new FormGroup feature as per https://tanstack.com/form/latest/docs/framework/react/guides/form-groups. In my wizard, I want to have a "Next Step" button which is only enabled if the form is valid (so true by default when entering the wizard, but disabling as soon as you make some invalid/ incorrect input)

Say I have a snippet similar to the example code:

const form = useForm({
    defaultValues: {
        step1: {
            name: ""
        },
        step2: {
            age: 0
        }
    }
})

return (
    <form.FormGroup
        name="step1"
        children={group => (
            <>
              <form.Field
                name="name"
                validators={{
                  onChange: ({ value }) => someCustomValidationLogic(value),
                }}
                children={(field) => (
                  <input
                    value={field.state.value}
                    onChange={(e) => field.handleChange(e.target.value)}
                  />
                )}
              />
              <button disabled={!group.state.meta.isFieldsValid}>Next</button>
            </>
        )}
    />
)

How do I make my step1.name field "understand" that it is now part of the outer FormGroup, so that group.state.meta.isFieldsValid gets passed to the button correctly? It seems that despite the documentation says...

children={group => (
  // `group` here has all of the form-like methods you'd expect like `deleteField` or `insertFieldValue`
  // ...
)}

...there is actually no group.Field that I can use to explicitly add a field as "you are part of this group now".

Do I have to hoist up all of my validation logic into the FormGroups onChange validation return object, when the custom logic was previously living inside all of the (many, many) nested fields? I have found that sub-fields are magically able to detect that they have an error when you return the correct key under a FormGroups onChange return value's fields key, but epecially with dynamic wizards (where the order of the steps might be up to user configuration) I am not sure whether squeezing all validation logic into the FormGroup that was previously residing separately in the individual form.Fields is desirable or even possible.

Any kind of advice would be appreciated! Thank you in advance :)