Working from your screenshot, the element div.field-value-text--default …
is not disabled
does not have a readOnly property or a readonly attribute
because it’s a DIV element. You cannot typically sendKeys to a DIV.
Moreover, a human user has no way to do what you’re trying to do so trying to write automation code to do what a human user cannot do is probably not a good idea. This is a case where you are modifying the AUT[1], for whatever reason (rarely a good idea).
What are you trying to achieve? What human action are you trying to recreate in code?