Achieving a shallow depth of field when shooting macro photography with a mirrorless camera requires careful control over your depth sensor and the range it is set to.
As a professional macro photographer, I know that getting my depth sensor set to the exact right range can make or break an image.
By reducing the range, more of the focus is shifted to your subject and away from the background.
This will give you the desired shallow depth of field and really make your subject stand out in your image.