How can I response a json result with QuotaExceededMessage instead of a string?

[Sharewithyou]

I Try to user it as folllowing:
QuotaExceededMessage = JsonConvert.SerializeObject(new ApiResult(429001, "it use frequently,only allow {0} per {1}")，please wait a moment"))
but it don't support ,
I just want to response a custom json result , how can I to implement

[glga-byte]

You can do that with QuotaExceededContent:
QuotaExceededContent = (rateLimit, key) => new { property="value" }