Hi,

If you already have some changes done in the form using the studio application, the following process will be easier for you.

When you make changes in the form using studio, it will create a record in ir.ui.view table in the db, holding the information of changes you have applied.

* Open debug mode
* Open the form view where you need to add the static text
* Click on Edit View: Form from the debugger button
* Click on inherited views page
* Scroll down to last and open the view named: studio customization's

And add below code:
  

Thanks