SonataAdminBundle - override form block for a specific form field with form_theme

Question

Generally I would override form row using a form_theme with a block named like this:

{% block _name_row %}
{% endblock %}

But Sonata's fields use some dynamic block prefix which look like this:

name="s653d5ae3064d3[name]"

Thus, general approach can't be used, because I don't this prefix is dynamic. How can I override the field then?