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/**
 * Form fields whose default text looks like "#listKey: col1, col2, ..." become a table.
 * Row 1 = the first person (top-level $wertePaare), then every entry in $wertePaare[listKey].
 */
private function insertTables(\DOMDocument $dom, array &$wertePaare, array $labels = []): void
{
    // Collect first: getElementsByTagName is a live list
    $anchors = [];
    foreach ($dom->getElementsByTagName('ffData') as $ff) {
        $config = $this->fieldDefaultText($ff);
        if (!preg_match('/^\s*#\s*(\w+)\s*:\s*(.+)$/u', $config, $m)) {
            continue;   // normal field, leave it to fillIn
        }
        $p = $ff;
        while ($p && $p->nodeName !== 'w:p') {
            $p = $p->parentNode;
        }
        if ($p) {
            $cols = preg_split('/\s*[,;]\s*/', trim($m[2]), -1, PREG_SPLIT_NO_EMPTY);
            $anchors[] = [$m[1], $cols, $p];
        }
    }

    foreach ($anchors as [$listKey, $cols, $p]) {
        $rows = [];

        // First person from the top-level values (skip if all columns are empty)
        $first = [];
        foreach ($cols as $c) {
            $first[$c] = $wertePaare[$c] ?? '';
        }
        if (array_filter($first, fn($v) => $v !== '' && $v !== null)) {
            $rows[] = $first;
        }

        // Additional persons
        foreach ((array) ($wertePaare[$listKey] ?? []) as $row) {
            $rows[] = (array) $row;
        }

        $parent = $p->parentNode;
        if ($rows) {
            $headers = [];
            foreach ($cols as $c) {
                $headers[$c] = $labels[$c] ?? $c;
            }
            $parent->insertBefore($this->buildTable($dom, ['headers' => $headers, 'rows' => $rows]), $p);
        }

        // Word needs a paragraph after a table at the end of a cell/document
        $next = $p->nextSibling;
        if ($next === null || $next->nodeName !== 'w:p') {
            $parent->replaceChild($dom->createElement('w:p'), $p);
        } else {
            $parent->removeChild($p);
        }
    }

    // Arrays must never reach the text-filling loops
    foreach ($wertePaare as $k => $v) {
        if (is_array($v)) {
            unset($wertePaare[$k]);
        }
    }
}

/** Default text (Standardtext) of a legacy text form field */
private function fieldDefaultText(\DOMElement $ff): string
{
    foreach ($ff->getElementsByTagName('default') as $d) {
        if ($d->parentNode->nodeName === 'w:textInput') {
            return $d->getAttribute('w:val');
        }
    }
    return '';
}