Add form field ID to form-group element in Symfony 4 bootstrap theme

custom_types.html.twig

{% use "bootstrap_4_layout.html.twig" %}

{% block form_row -%}
    {%- if compound is defined and compound -%}
        {%- set element = 'fieldset' -%}
    {%- endif -%}
    {%- set widget_attr = {} -%}
    {%- if help is not empty -%}
        {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
    {%- endif -%}
    <{{ element|default('div') }}{% with {attr: row_attr|merge({class: (row_attr.class|default('') ~ ' form-group ' ~ id ~ '-group')|trim})} %}{{ block('attributes') }}{% endwith %}>
    {{- form_label(form) -}}{{- form_help(form) -}}
    {{- form_widget(form, widget_attr) -}}
    </{{ element|default('div') }}>
{%- endblock form_row %}

Add to twig.yaml

twig:
      .....
      form_themes: ['form/custom_types.html.twig']