Hierarchy predicates not supported in non-sexp syntax

### OS/platform

Linux

### Emacs version and provenance

28.2, self compiled, no special distribution

### Emacs command

emacs

### Org version and provenance

9.6.1, straight.el

### org-ql package version and provenance

latest commit straight from git

### Actions taken

Trying to filter nodes with ancestors containing "hello" in the headline

(org-ql--query-string-to-sexp "ancestors:query=h:hello")
(org-ql--query-string-to-sexp "ancestors:h:hello")
(org-ql--query-string-to-sexp "ancestors:(h:hello)")

### Observed results

None of the queries I constructed in analogy with the readme works.

### Expected results

I want to use the "line syntax" with nested queries somehow

### Backtrace

```elisp
No error
```

### Etc.

_No response_