revisit the inputs and outputs.

[jkowalleck]

@mrutkows emphasized to revisit the inputs and outputs.
❗ they should be key value pairs, instead of strings.

• input and output should be Key-Value-pairs instead. key should be string, value should be either string, number, int, float, boolean...any scalar type.
• @stevespringett mentioned we should use the existing "parameter", that should be used for input/output.

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Originally posted by @jkowalleck in #222 (comment)

[jkowalleck]

@stevespringett would move this ticket to 1.6 - i do not see any work done here.
I'd recommend putting it as a 2.0 task