K2 REST Service Broker content-type question

Hi All,

I'm trying to update work items in Azure DevOps via K2 REST Service Broker, however I always receive 400 Bad Request. My question - does K2 4.7 support "application/json-patch+json" Content-Type? If yes, please provide HttpHeader object.
Here is mine:
{"$type":"SourceCode.SmartObjects.Services.Endpoints.Common.HttpHeader[], SourceCode.SmartObjects.Services.Endpoints.Common, Version=4.0.0.0, Culture=neutral, PublicKeyToken=null","$values":[{"$type":"SourceCode.SmartObjects.Services.Endpoints.Common.HttpHeader, SourceCode.SmartObjects.Services.Endpoints.Common, Version=4.0.0.0, Culture=neutral, PublicKeyToken=null","Name":"content-type","Value":"application/json-patch+json; charset=utf-8"}]}
Thank you in advance for response.