http2 decrypted data in tshark lua script

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Hello

I have a code for fetching data from HTTP2 headers:

local http2_headers_field = Field.new("http2.headers")
...
http2_headers = tostring(http2_headers_field())

It works, but I got byte string with HPACK(like "88:" - status 200). How can I get something like data in "Decompressed header" tab(at the bottom of the screen) in Wireshark?

https://www.dropbox.com/s/ag3rev29l52...