<dependency>
  <groupId>org.json4s</groupId>
  <artifactId>json4s-ext_2.13</artifactId>
  <version>3.5.5</version>
</dependency>

implementation 'org.json4s:json4s-ext_2.13:3.5.5'

implementation("org.json4s:json4s-ext_2.13:3.5.5")

libraryDependencies += "org.json4s" % "json4s-ext_2.13" % "3.5.5"

@Grapes(
  @Grab(group='org.json4s', module='json4s-ext_2.13', version='3.5.5')
)

<dependency org="org.json4s" name="json4s-ext_2.13" rev="3.5.5" />

[org.json4s/json4s-ext_2.13 "3.5.5"]

'org.json4s:json4s-ext_2.13:jar:3.5.5'