Is it possible to set android version code and name via a Gradle task?

I'm trying to automate build process on CI that I'm working with. I am able to call a curl and assign it some variables such as version code and names. Then CI (in my case Bitrise CI) catch it and starts Release build. However, before that I want to set version code and version name based on what has been passed by curl into build.gradle file and then build process starts.

So, I'm thinking I can write a plugin/task that gets version code/name from a command line and then inject it in build.gradle file. A command like ./gradlew setVersion 1 1.0.

Threefore, by running this command from an script that I'll write, I will be able to run this gradle task and everyone from anywhere in the glob is able to create a release build by curl. Quite interesting :)

I am able to write a task similar to following code an put it into my main build.gradle file.

task setVersion << {
    println versionCode
    println versionName
}

and pass it some parameters via command line:

./gradlew -PversionCode=483 -PversionName=v4.0.3 setVersion

This is my output:

:setVersion
483
v4.0.3

BUILD SUCCESSFUL

Total time: 6.346 secs

So far so good. My question is how to set it in build.gradle file?