How to add an attribute without value to a tag? (eg: disabled attribute)

Hi All,

I want to add the 'disabled' attribute to textarea tag by checking whether the read-only field functionality is enabled or not. If the user wants the textarea to appear as disabled, I have to add the disabled attribute to the textarea tag.

Is it possible to add this attribute without a value? Currently, I use the code:

But when I use this code, I get my resulting tag look like this in html:

I want the disabled attribute without a value like the below code after checking whether the user had enabled "${properties.disabled}" or not.

Kindly help me figure a way to add the attribute by checking for the condition without adding a value along with the attribute.