scala using github repo as a libraryDependencies - scala

Question

I was facing one error while trying using RootProject
I need to use gatling snapshot version which is 3.5.0-SNAPSHOT and to enable this I know two options:-
using git clone and then sbt publishLocal finally using this jar as an unmanaged dependency, This works fine but it is rather more manual work, So I moved to the second option.
Using sbt RootProject, so let me first explain the project setup:-
example/Build.sbt
lazy val gatling = RootProject(uri("https://github.com/gatling/gatling.git"))
lazy val root = (project in file("."))
.settings(
name := "example",
version := "0.1",
scalaVersion := "2.13.3"
).dependsOn(gatling)
example/project/plugins.sbt -> These two were added because it was required while building the project
addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.9.21")
libraryDependencies += "org.scala-sbt" %% "io" % "1.4.0"
example/src/main/scala/Main.scala
import io.gatling.core.scenario.Simulation
object Main extends App {
class A extends Simulation
val a = new A
println(a.toString)
}
So after this executing sbt run will result in a successful build.
But the problem starts when I tried to import gatling-highcharts in a similar fashion as:-
lazy val gatling = RootProject(uri("https://github.com/gatling/gatling.git"))
lazy val gatlingHighCharts = RootProject(uri("https://github.com/gatling/gatling-highcharts.git"))
lazy val root: Project = (project in file("."))
.settings(
name := "example",
version := "0.1",
scalaVersion := "2.13.3"
).dependsOn(gatling, gatlingHighCharts)
now executing sbt will result in an error as:-
[error] not found: C:\Users\user\.ivy2\local\io.gatling\gatling-recorder\3.5.0-SNAPSHOT\ivys\ivy.xml
[error] not found: https://repo1.maven.org/maven2/io/gatling/gatling-recorder/3.5.0-SNAPSHOT/gatling-recorder-3.5.0-SNAPSHOT.pom
[error] not found: https://jcenter.bintray.com/io/gatling/gatling-recorder/3.5.0-SNAPSHOT/gatling-recorder-3.5.0-SNAPSHOT.pom
And this was because gatling is being used via dependsOn while actually there is nothing available to do like:-
lazy val gatlingHighCharts = RootProject(uri("https://github.com/gatling/gatling-highcharts.git")).dependsOn(gatling)
This is not possible as there is no method named dependsOn inside RootProject class and I am not able to figure out how to make that work.
Can anyone help me to figure out how can I make that work?
Plus, if somehow exist a way to use github repo jars directly as managed sources instead of unmanaged sources which is something like
libraryDependencies += "io.gatling.highcharts" % "gatling-charts-highcharts" % "3.5.0-SNAPSHOT"
without using dependsOn.