$default-variables: (
  "Input-Group__Item____left-offset": calc(-1 * var(--Input____border-width)),
);

@mixin generate-input-group-theme-variables($theme-variables: ()) {
  $variables: map-merge($default-variables, $theme-variables);

  @each $name, $value in $variables {
    --#{$name}: #{$value};
  }
}