I want to find out if there is an option to use nginX for following scenario:

We have exposed the APIs which only support POST method.
For the security side and not exposing the actual names of those APIs we would like to find solution so that the request is processed via nginX. I have tried various options in nginX but not getting the right path. Please suggest which approach should be used here.

Also , is it possible to convert GET request to POST from nginX and get successful response if APIs do not support GET method?

Please suggest, let me know if any more info is needed from my side.