I like it, very concise but retains all the features you need.

`jq` can construct JSON "safely" from shell constructs, but is rather more verbose - e.g. with the same examples:

        $ jq -n --arg name Jane '{"name":$name}'
        
        $ jq -n \
        --argjson time $(date +%s) \
        --arg dir $HOME \
        '{"time":$time,"dir":$dir}'
        
        $ jq -n '$ARGS.positional' --args spring summer winter
        
        $ jq -n \
        --arg name JP \
        --argjson object "$(
          jq -n \
          --arg fruit Orange \
          --argjson point "$(
            jq -n \
            --argjson x 10 \
            --argjson y 20 \
            '{"x":$x,"y":$y}' \
          )" \
          --argjson number 17 \
          '{"fruit":$fruit,"point":$point,"number":$number}' \
        )" \
        --argjson sunday false \
        '{"name":$name,"object":$object,"sunday":$sunday}'