This is a simple template I created on GoogleSheet to help students self-assess (for a course that must be graded out of 10) using the SOLO taxonomy for each competency (under three roles).
As students edit the table, the spider graph will be automatically created and help them see where they were at the start of the course and where they are at the mid-point (and later on, at the end of the course).
This particular sheet is meant for a specific context. As you can see, there are steps and questions for students to prepare. These might be useful to you as well. Feel free to make a copy here and make adjustments to address your context and needs. Best!