How do I modify the output of get_the_tag_list()?

At present
I’ve this code

$tag_list = get_the_tag_list('<ul><li>','</li><li>','</li></ul>');

and outputs:

<ul>
    <li><a href="tag_link">tag_name</a></li>
    ....
</ul>

How can I modify it so it shows like this?

<ul>
    <li><a href="tag_link"><span>tag_name</span></a></li>
    ....
</ul>