Add read-only trait for all controls

We are using grapejs to create webpages. We are doing some back end manipulation of the json to link each child of the html (usually a row) to a record in our database. To that end, I've added a trait to every component called custompk. Upon saving the grapejs, I loop through the first level of components and add a record. Then I update the custompk with the primary key of the record in the database. The json has the appropriate trait and the html shows the custompk that I need. The last thing I'd like to do is to make the custompk trait read only while looking at the page through grapejs. Si...