Drupal 8 Twig: hide a (paragraph) field based on the value of a sibling field

field--field-unit-plural.html.twig

{#
  This snippet is from a component based (Emulsify / Pattern Lab) custom Drupal theme.
  The "span_…" variables are the properties of the BEM Twig function.
  See: https://www.fourkitchens.com/blog/development/bem-twig-function/
  
  The goal is to set the default display correctly (when the page loads). 
  After that the field visibility is manipulated by JS based on user interaction.
#}

{% set amount = element['#object'].field_amount.value %}

{% if amount <= 1 %}
  {% set span_extra_value = ['hidden'] %}
{% endif %}

{% include "@atoms/_field-span.twig" with {
  span_blockname: 'ingredient',
  span_base_class: 'unit',
  span_modifiers: ['plural'],
  span_extra: span_extra_value,
} %}