How to convert data.data in Base64 to human readable format?

Hello,

I know Follow TCP Stream do this, but I use custom columns and need to see human readable text instead of 32:30:30:20:43:6f....

is it possible with Lua/Python or with some patch?

nice feature if I could define custom column this way:

decode_base64(data.data)
tolowcase(data.data)
is_base64(data.data) ? decode_base64(data.data) : data.data
decode_base64(bytes[10-34])

BR