I am using Arduino and ESP-01 and Blynk IoT, yes.
My voice assistant is Alice, not Alexa.
And I do not completely understand how to set up IFTTT for Alice. Alice is not in IFTTT, but Alexa and Google Assistant are there.
I’ve just googled the Alice voice assistant and it appears that it is a plug-in for the Yandex browser and doesn’t have an API.
If this is the case then you won’t be able to use it with IFTTT or Blynk.
I think that contrib is used to get the speaker to speak the words you want it to, rather than listening for inputs.
While it might be useful to get the speaker say what the temperature is, it still needs a different type of contrib to listen for the “what is the temperature” question before the response can be spoken.
TBH, it would be much simpler (and probably cheaper) to go for the Alexa or Google devices.