Manual entry about text object :
ote if WebGL is enabled in project properties, due to technical limitations all Text objects appear on top of everything else in the game. For example, Sprites cannot be displayed on top of Text objects when WebGL is on, because the text is rendered to an overlay above the game. It is recommended to design your game so it is not necessary for other objects to appear on top of text objects, since turning off WebGL can reduce performance.
For scrolling some block of text inside a text object I had done this capx a while ago.