It seems that while using FigJam, only “Bold” and “Strikethrough” are two options for formatting text. Where are any options such as Italic, Underline for text. I think more options would be better to represent ideas or collaboration in some ways.
Ah, thank you very much, I’ve found it 
Thanks @tank666 for point it out!
Since feature suggested already exists in FigJam, I will close this topic.
Feel free to create a new topic, if you have further ideas or improvements in mind.