Keep text properties in shell buffer

[chep]

I'm using shell-maker for github copilot. I would like to have markdown management in my shell. I tried polymode but as it create buffers that I can't manage, I had weird bugs.

Now I write copilot answer in a temporary buffer using markdown mode, then copy text with properties and send it to shell-maker callback.

When the text is inserted in the buffer, all properties are lost.

Is it possible to keep properties ? I'm trying to look at the code but I haven't find anything yet.

Thanks.