JSON from Controller to List

Question

I have a simple method in the controller that returns me a list of days as JSON. (public JsonResult GetReservedDaysJson()) Result:

["2022-03-29","2022-03-30"]

I want to use this JSON file as a list of days on other method. How to achieve this?

I tried these solutions:

dynamic jsonObj = JsonConvert.DeserializeObject(GetReservedDaysJson().ToString());