Is there any way to send additional data when making payments?

[Srtake]

According to ILP SPSP specification, given the open STREAM connection, either the SPSP Client or the Server can begin sending ILP packets of data. In a wallet, we may want to send these additional data when making payments to satisfy our business requirements.

In Interledger.js ilp packet, there is an optional data field in PayOptions in spsp.ts. Could you tell me whether there is any approach to implement this functionality? I researched the HTTP APIs of Interledger-rs, but have not found it yet.