ITextShape.Text
ITextShape

property Text: WideString;

Type Library
TeeChartx

Description
Defines the text to display inside the shape.

Text might contain "line breaks" (the #13 character) to display multiple lines of text.

with tChart1.Tools.Items(0).asAnnotation.

.Shape.Text = "Hello" & chr(13) & "World !"

See also: TextAlignment and AutoSize properties.