Home Assistant Jinja template to create fast customize for groups, sensors, covers etc... Just change that first line below 'sensor' to 'group', 'covers' etc..

hass_generate_customize.j2

{% for state in states.sensor -%}
{% if loop.first %}
{% elif loop.last %}
{% else %}
{% endif %}
{{- state.entity_id }}:
friendly_name: '{{ state.attributes.friendly_name|replace("_"," ",)|title() if state.attributes.friendly_name is defined else state.name|replace("_"," ",)|title() }}'
emulated_hue_hidden: {{state.attributes.emulated_hue_hidden if state.attributes.emulated_hue_hidden is defined else 'False' }}
hidden: {{state.attributes.hidden if state.attributes.hidden is defined else "False"}}
homebridge_hidden: {{state.attributes.homebridge_hidden if state.attributes.homebridge_hidden is defined else "true"}}
{{'icon: '+ state.attributes.icon if state.attributes.icon is defined}}
{{'homebridge_cover_type: '+ state.attributes.homebridge_cover_type if state.attributes.homebridge_cover_type is defined}}
{{'assumed_state: '+ state.attributes.assumed_state if state.attributes.assumed_state is defined}}
{% endfor %}