The community member is asking if there is a way to specify prompt partials like variables, without having to pass the entire partial text. Another community member suggests using {{>>your_partial_variable}}, which will expose a variable named your_partial_variable in the prompts API, allowing the user to explicitly pass any prompt partial ID. The community members discuss the documentation for this feature, and one member notes that the documentation covers the supported tags, including the use case described here.
The above document contains everything actually. Maybe my description here on Discord is more lucid than what's in docs - but it also intends to capture the same thing