So you need some predefined rules to convert Mathematica objects listed in the screenshot to either list of rules or associations.Check the attached notebook for code.
Since ExportForm takes the same options as Export, the following code automatically works
CloudDeploy@ExportForm[input, "JSON",
"ConversionRules" -> {
Quantity[magnitude_, unit_] :> <|"magnitude" -> magnitude, "unit" -> unit|>,
DateObject[{ele_}, others__] :> <|"Year" -> ele|>,
GeoPosition[{lat_, lon_}] :> <|"latitute" -> lat, "longitute" -> lon |>
}
]
Attachments:
