Subquery in expressions support

It seems to subqueries are poorly supported

Some examples first:

SELECT * FROM (SELECT * FROM b) a

...
PhpMyAdmin\SqlParser\Components\Expression Object
(
    [database] =>
    [table] =>
    [column] =>
    [expr] => (SELECT * FROM b)
    [alias] => a
    [function] =>
    [subquery] => SELECT
)
...

SELECT * FROM a WHERE a.field IN (SELECT * FROM b)

...
...
PhpMyAdmin\SqlParser\Components\Condition Object
(
    [identifiers] => Array
        (
            [0] => a
            [1] => field
            [2] => b
        )

    [isOperator] =>
    [expr] => a.field IN (SELECT * FROM b)
)
...

So I have an idea. May be there must be separate ExpressionParser generating AST for expression? Those (including me) who needed parsed expression can use it (and extract subselects, and parse it with regular parser), and there will be no compatibility break.

Does it sounds as a good plan? If it does, I would like to implement it.

Beginne damit, den bestehenden Pfad zur Ausdrucksanalyse und den in den Beispielen beschriebenen regulären Parser zu untersuchen. Ermittle, wie ein separater ExpressionParser Unterabfragen darstellen und extrahieren könnte, ohne die Kompatibilität zu beeinträchtigen, und überprüfe anschließend, ob die SELECT- und WHERE IN-Beispiele verwendbare geparste Unterabfragen erzeugen.