Add custom field in shortcode

Hello,

It could be possible to add the value of a post custom field as a field in the form.
I’m thinking in somethink like that:

template-xxx.php
--------------------
$my_field = get_the_field('the_field');
<?php echo do_shortcode( '[contact-form-7 id="7528" my_field=$myfield ); ?>

If not, is there any workaround to have this?
Thanks.

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