How to fill authorization fields correctly

[D_K_69]

Hi there,
I need to tune getting some metrics after authorization. This script works successfully in cli,

curl --location --request POST 'https://myhost/somelocation/api/login' --header 'Content-Type: application/json' --data-raw '{ "username": "username", "password": "password", "realm": "myrealm"}'

but may be I am wrong filling fields in a one step of tuning of web page's monitoring becouse I get either 405 or 415 error.
The current tune is on the screenshot. Could you advice please what wrong I have done?