How to get all tags in a subtype ?

I want to get all tags in a subtype

for example

subtype Blogs  has 4 post , with tags : economy, economy,politic, nature


subtype Pages has 2 post , with tags : news, opinion


how to get list of Blogs tags

  • economy,
  • politic ,
  • nature

and Pages tags

  • news,
  • opinion



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