Option for customizable prompt context

I run a language and lesson resource site for international teachers in Japan. Translating nodes manually I have discovered that additional context in the translation instructions leads to better results.

Would it be possible to add in some options for adding contextual instructions to the prompts? For example:
"Please translate the following lesson into _____. Lessons are for both native and non-native English speaking teachers teaching Japanese students primarily at the Elementary and Middle school levels."