Is it necessary for the workacation visa employment contract to specify 'remote' or 'home-based'?

For the workacation visa in Thailand, it is generally required that the employment contract explicitly states that the job is 'remote' or 'home-based.' Several comments suggest that the contract must mention 'abroad,' and specifying Thailand is a plus for clarity. However, some people indicate that instead of the contract, a separate letter from the employer confirming the ability to work remotely from Thailand may suffice. It's noted that requirements can vary by embassy, highlighting the need for documentation that aligns with the specific embassy's guidelines.