Can we set proxy server which will be used whenever application makes any REST API calls ?

We have a requirement where we will be hosting external package to Mendix App . This package is built with different technology stack such as vue, react and SWF. We are planning to make this package as a part of Mendix deployment package. Whenever the package makes any REST API calls, we want to route it to proxy server. E.g. if the external package makes a call 'http://localhost:8080/api/init' we would like to route it to a proxy server 'http://gatewayhost/api/init'. As mentioned in the​, I tried to set ‘http.proxyHost’ via ‘App > Settings > Configurations > Custom tab’ but no luck.  
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