How do you update attached data using the Finesse Media API?

Scenario:

1. A wechat customer request routes to the agent A.
2. The agent A answers the task
3. Then agent A transfers the task to the Agent B
4. Before the transfer operation, agent A should do the following steps:
   1. Specify the agentB
   2. Click the transfer button

In the step1, how do you update attach data before the transfer operation? We want to set the agentID to Agent B to "PV1....PV10" so that the script can queue the request to the agentB.

Unfortunately, updating call variable data is not supported yet. Also, transfers to specific agents is also not supported. You can workaround the issue by configuring the script selector to target specific agents, but it is probably a lot of overhead.