Grid Item Column Span Variations Each item can span from 1 to 12 columns. Use any combination that adds up to 12 columns to form a row.
Important Notes:

In this example, the item 1 is starting at column 1 and spanning 3 columns wide, the item 2 is starting at column 4 and spanning 9 columns.
Demo
Item 1
Item 2
Twig
{% include '@bolt-layouts-grid/grid.twig' with {
  items: [
    {
      column_start: '1',
      column_span: '3',
      content: item_1,
    },
    {
      column_start: '4',
      column_span: '9',
      content: item_2,
    },
  ]
} only %}
HTML
<bolt-grid>
  <bolt-grid-item column-start="1" column-span="3">
    <!-- Item 1 Content -->
  </bolt-grid-item>
  <bolt-grid-item column-start="4" column-span="9">
    <!-- Item 2 Content -->
  </bolt-grid-item>
</bolt-grid>