At the beginning of each session the coach could ask the coachee to keep a Feelings Diary to explain the meaning of various emotions/feelings and promotes a conversation with the coachee about in which situations they experience the discussed emotion.
You can ask the coachee to draw how they are feeling in Paint at the beginning of the session. They can save each drawing and can build up a workbook or diary over time. A helpful source is provided below:
https://hope4hurtingkids.com/resources/My-Feelings-Workbook.pdf