setting some fields, like Priority or a custom field

[netphantm]

Hi
I want to be able to set the priority according to a list of services, like for example even if swap is CRITICAL, it can be set to medium, but if it's a disk check, it should be set to highest priority. I tried to set the 'Priority' field via templates and it doesn't work. Could that be added as an argument perhaps, like in the case of --ack-author <author>?
This is possible via an API call:

$CURL PUT 'https://$JIRA_SERVER/rest/api/2/issue/$incident_id' $HEADERS \
--data-raw '{
  "update" : {
      "priority":[{"set":{"name":"$prio"}}]
  }
}'  

where $prio is one of (Critical High Medium Low)

I wanted to set another field (using templates), like

customfield_10115 = "Monitoring"

but it won't work. If I set it manually and check the ticket over the API, this field contains the following:

    "customfield_10115": {
      "_links": {
        "jiraRest": "https://jira-dev.foobar.com/rest/api/2/issue/26825",
        "web": "https://jira-dev.foobar.com/servicedesk/customer/portal/4/SD-1241",
        "self": "https://jira-dev.foobar.com/rest/servicedeskapi/request/26825"
      },
      "requestType": {
        "id": "96",
        "_links": {
          "self": "https://jira-dev.foobar.com/rest/servicedeskapi/servicedesk/4/requesttype/96"
        },
        "name": "Monitoring",
        "description": "HQITSMXX-58",
        "helpText": "",
        "serviceDeskId": "4",
        "groupIds": [],
        "icon": {
          "id": "10632",
          "_links": {
            "iconUrls": {
              "48x48": "https://jira-dev.foobar.com/secure/viewavatar?avatarType=SD_REQTYPE&size=large&avatarId=10632",
              "24x24": "https://jira-dev.foobar.com/secure/viewavatar?avatarType=SD_REQTYPE&size=small&avatarId=10632",
              "16x16": "https://jira-dev.foobar.com/secure/viewavatar?avatarType=SD_REQTYPE&size=xsmall&avatarId=10632",
              "32x32": "https://jira-dev.foobar.com/secure/viewavatar?avatarType=SD_REQTYPE&size=medium&avatarId=10632"
            }
          }
        }
      },

can this also be set using templates somehow?