ServiceNow - Get last short_description

From service now the short description is in an array

Example

{
"results": [
{
"number": "INC0011301",
"short_description": "lorem ipsum short description 0 my new incident"
},
{
"number": "INC0011302",
"short_description": "lorem ipsum short description 1 my new incident"
},
{
"number": "INC0011303",
"short_description": "lorem ipsum short description 2 my new incident"
},
{
"number": "INC0011304",
"short_description": "lorem ipsum short description 3 my new incident"
},
{
"number": "INC0011309",
"short_description": "lorem ipsum short description 8 my new incident"
},
{
"number": "INC0011310",
"short_description": "lorem ipsum short description 9 my new incident"
},
{
"number": "INC0011311",
"short_description": "lorem ipsum short description 0 my new incident"
},
{
"number": "INC0011312",
"short_description": "lorem ipsum short description 1 my new incident"
},
{
"number": "INC0011313",
"short_description": "lorem ipsum short description 2 my new incident"
},
{
"number": "INC0011314",
"short_description": "lorem ipsum short description 3 my new incident"
},
{
"number": "INC0011315",
"short_description": "lorem ipsum short description 4 my new incident"
},
{
"number": "INC0011326",
"short_description": "lorem ipsum short description 15 my new incident"
}
]
}

To get the last one assign this json path to an variable

$.results[-1:].short_description

Update Issue

{
	"fields":
	{

	"description": "{{description}}",

	"summary": "{{short_description}}",

	"customfield_10604": "https://i765redcvbloiupo/incident.do?sys_id={{sys_id}}",

	"customfield_10631": "{{sys_id}}"

	}
}