Extracting data from Weather API and inserting into GraphQL server

I am using http request node to call weather API. I want to insert minimum and maximum temperature values into my GraphQL server table. Utilizing this particular syntax for inserting into table (writing this into the GraphQL node):

mutation {
** insert_Weather_one (object:**
** {**
** Temp_Max: payload.main.temp_max**
** Temp_Min: payload.main.temp_min**
** }**
** ){**
** Temp_Max**
** Temp_Min**
** }**

The payload.main.temp_min is the path to minimum temperature inside the Weather API. However I am not able to insert data using this method. Could anyone suggest another to do the needful or maybe point out a mistake that I am making. It would be really helpful.