<dependency>
  <groupId>org.webjars.npm</groupId>
  <artifactId>bootstrap</artifactId>
  <version>4.4.0</version>
</dependency>

implementation 'org.webjars.npm:bootstrap:4.4.0'

implementation("org.webjars.npm:bootstrap:4.4.0")

libraryDependencies += "org.webjars.npm" % "bootstrap" % "4.4.0"

@Grapes(
  @Grab(group='org.webjars.npm', module='bootstrap', version='4.4.0')
)

<dependency org="org.webjars.npm" name="bootstrap" rev="4.4.0" />

[org.webjars.npm/bootstrap "4.4.0"]

'org.webjars.npm:bootstrap:jar:4.4.0'