In the dimension drawing, you can add texts both inside and outside the drawing.
You do this by clicking on the symbol with the A under ‘Tools’. Draw a text box where you want to place the text and type the desired text.
If you want to change the layout of the text, click on the text you have just typed. You can then adjust the font size and rotation, and change the colour of the text.

I you want to use the text more often in a design, you can save it as a template by clicking ‘Save template’ and giving your template a name. The formatted text you just added will now be added under ‘Templates’. You can drag a template into your design to add it to any dimension drawing.