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RichTextLabel allows the display of complex text markup in a control. It has a built-in API for generating the markup, but can also parse a BBCode. List of bb code commands.

Example with richtext box(var text_box). BB code is first enabled for use and then set with set_bbcode.

text_box.set_use_bbcode(true)
text_box.set_bbcode("Info
about\n[center]Some vegetation on level two[/center]")
# \n is bb code for new line