Yes, you can participate in the special and spot round counselling for JAC Chandigarh. Since you have already been allotted ECE in CCET, you can still opt for higher preference courses like CSE in the special round if seats are available.

Make sure to follow the instructions provided by the counselling authority and keep an eye on the official website for updates regarding the special and spot rounds. Be prepared to fill in your preferences again and ensure all necessary documents are ready for submission.