tailwind-lookup-tabe.twig

{# List out all the classes we *may* want to use, so they are not purged #}
{% set spacing_levels = {
  1: 'u-o-1',
  2: 'u-o-2',
  3: 'u-o-3',
  4: 'u-o-4',
  5: 'u-o-5',
  6: 'u-o-6',
  7: 'u-o-7',
  8: 'u-o-8',
} %}

{# Pick a Tailwind class from the lookup table based on the 'spacing' field's value from the CMS. If there is no value from the CMS then use option 3 #}
{% set spacing_level_utility = attribute(spacing_levels, node.field_spacing.value|default(3)) %}