In general, the truthful response is YES. Microwaving silicone is OK. It won't harm the silicone tableware or release harmful chemicals. However, there is a snag.
Silicone has a high-temperature tolerance of 400° F to 450° F. (about 204 to 232 degrees).
As a result, while cooking silicone in the microwave, the temperature should not exceed 200 degrees. You'd have to double-check that the silicone bowl or plate you're using is food-safe. If it doesn't, there's no way of knowing if it'll endure the heat and won't leak harmful compounds.
As a result, whether you're shopping for silicone molds, plates, or bowls, seek for the "microwave-safe" marking.