This question already has an answer here:
What is the correct punctuation when repeating a question as a statement?
See the following example, and my best guess:
John: Sorry I missed your phone call. What's happening?
Bob: I was wondering if you wanted to get some lunch.
My discomfort with Bob's response is the following: Bob's response very strongly alludes to an underlying question, but because it is technically a statement, it doesn't get punctuated with a question mark.
If I wanted to communicate this response but include a question mark (to more obviously visually communicate that there is a question that needs answering), how could this be done?
My best idea is to simply restate the question in its entirety and join with a colon. For example (please correct me if any part of is incorrect):
I was wondering: "Do you want to get some lunch?"