I want to boxes like this. Is it possible with this theme

You could use HTML and CSS like W3 schools provides here:

https://www.w3schools.com/w3css/w3css_progressbar.asp

It does mean editing HTML each time you update it. For a more slick version would probably require some PHP and Custom fields.

Ok got it.
Can you tell me how to add a background color inside a table row

You would need to convert the block to HTML then look for the <tr>row content here</tr> you wish to change. And then add a class to that element eg.

<tr class="red-row">row content here</tr>

Then use some CSS e.g

tr.red-row {
    background-color: red;
}