[Python] Python jsonschema with definitions

I'm validating a JSON schema, but the schema uses "Definitions", as in the example below. Using schema validation sites everything is ok, but in code with jsonschema I have the error:

PointerToNowhere: '/definitions/ipv4_pattern' does not exist inside {}


Does jsonschema not work with definitions?

import jsonschema

def main():
str_json_yaml= {
"version": 1,
"group": "infrastructure",
"service": "monitoring",
"tech": "172.21.101.155"}

str_json_schema = {
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"properties": {
"version": {
"type": "integer"
},
"group": {
"type": "string"
},
"service": {
"type": "string"
},
"tech": { "$ref": "#/definitions/ipv4_pattern" }
},
"definitions": {
"ipv4_pattern": {"type": "string",
"pattern": "^(?=\\d+\\.\\d+\\.\\d+\\.\\d+$)(??:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])\\.?){4}$"
}
}
}

validator = jsonschema.Draft202012Validator({})
obj_return = validator.evolve(schema=str_json_schema)

lst_errors = []
for error in obj_return.iter_errors(str_json_yaml):
lst_errors.append('Item: ' + error.json_path + ' / Error: ' + error.message)
if len(lst_errors) > 0:
print(*lst_errors, sep='\n')
return False
else:
return True

if __name__ == "__main__":
print(main())

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