  <item style="height:2ch">4</item>
  <item style="height:2ch">5</item>
</grid>

<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <item>4</item>
  <item style="height:2ch; grid-row:2">5</item>
</grid>

<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <item>4</item>
  <item style="height:4ch; grid-row:2/span 2">5</item>
</grid>

<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <item>4</item>
  <item style="grid-row:2/span 2">5</item>
  <item style="height:5ch; grid-row:span 3