Possible to add a custom system prompt somwhere?

[jarodise]

Hi, thanks for making this plugin, it's simple and functional, I am wondering if it is possible to add a system prompt somewhere in the config lua file, currently you need to type in the prompt and send along with the highlighted text to the API, and it's not very easy to type within the koreader interface, it would be great if a default custom system prompt and send together with the highlighted text with one click to the AskGPT button, e.g. "summarize the highlighted text". Do you think it is possible?