COBRA premiums are considered a qualified medical expense. If your employer offers an HRA account ("Health Wallet"), you can use this account to cover a portion or all of your COBRA premiums.
However, you must also purchase an individual health plan. This means you will have two health insurance plans.
Keeping your COBRA plan typically does not make financial sense. You may also have an issue with your health insurers coordinating your benefits. For example, both insurers may claim to be the "secondary" insurer, which could lead to delays in your claims getting paid or your claims getting denied.