Suggest you ask CW in Bangkok for their specific OA visa extension requirements. Then you will know for sure.
The newly issued OA visas in home country require the new insurance amount of 3 Million Thai baht...
Renewals inside Thailand until October 1, 2022 still requires the current 40,
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,000 inpatient / outpatient insurance.
The new rules allow use of policies issued by Thai and foreign insurers.
To use a foreign insurer for extending your current OA before October 1 inside Thailand may or may not be accepted by your Thai immigration office. Ask them.
If its accepted now or after October 1, 2022 it needs to be accompanied by the completed Foreign Insurance Certificate with your application of OA extension.