golden hour

/home/godaofbq/besthyperbaric.com/wp-content/plugins/oxygen/plugin/dynamic-data/fields/post

File/Folder	Size	Actions
.htaccess	420 B
post-comments-number.php	1.4 KB
post-content.php	688 B
post-custom-field-image.php	1.1 KB
post-custom-field-oembed.php	1005 B
post-custom-field.php	1.25 KB
post-date.php	2.91 KB
post-excerpt.php	687 B
post-featured-image-url.php	1.03 KB
post-featured-image.php	852 B
post-image-attachment.php	1.24 KB
post-image-attachments.php	826 B
post-permalink.php	771 B
post-terms.php	1.9 KB
post-time.php	2.93 KB
post-title.php	639 B

Edit: post-custom-field-image.php

<?php

namespace Breakdance\DynamicData;

class PostCustomFieldImage extends ImageField
{

/**
     * @inheritDoc
     */
    public function label()
    {
        return 'Custom Field (Image URL)';
    }

/**
     * @inheritDoc
     */
    public function category()
    {
        return 'Post';
    }

/**
     * @inheritDoc
     */
    public function slug()
    {
        return 'post_custom_field_image';
    }

/**
     * @inheritDoc
     */
    public function controls()
    {
        return [
            \Breakdance\Elements\control('key', 'Key', [
                'type' => 'text',
                'layout' => 'vertical',
            ]),
        ];
    }

/**
     * @inheritDoc
     */
    public function returnTypes()
    {
        return [
            'image_url'
        ];
    }
    /**
     * @inheritDoc
     */
    public function handler($attributes): ImageData
    {
        if (empty($attributes['key'])) {
            return ImageData::emptyImage();
        }

$url = get_post_meta(get_the_ID(), $attributes['key'], true);
        return ImageData::fromUrl($url);
    }
}