$bodyBlocks = [];
foreach ($entry->getFieldValue('pageBuilder')->all() as $block){
    switch ($block->type->handle) {
        case 'blockText':
            $bodyBlocks[] = $block->blockTextContent;
            break;
        }
    }

// Begin defining the response data for this entry
$data = [
    'title' => $entry->title,
    'slug' => $entry->url,
    'status' => $entry->status,
    'textArea' => $bodyBlocks
];

"title": "Title Here",
"slug": "slug-here",
"status": "live",
"textArea": [
    "<p>Text from first 1st block</p>",
    "<p>Text from first 2nd block</p>",
    "<p>Text from first 3rd block</p>",
],
"heroBanner": "img.jpg",

"title": "Title Here",
"slug": "slug-here",
"status": "live",
"textArea": [
    "<p>Text from first 1st block</p> <p>Text from first 2nd block</p> <p>Text from first 3rd block</p>",
],
"heroBanner": "img.jpg",