<dependency>
  <groupId>org.reactivemongo</groupId>
  <artifactId>reactivemongo-core_2.12</artifactId>
  <version>0.20.9</version>
</dependency>

implementation 'org.reactivemongo:reactivemongo-core_2.12:0.20.9'

implementation("org.reactivemongo:reactivemongo-core_2.12:0.20.9")

libraryDependencies += "org.reactivemongo" % "reactivemongo-core_2.12" % "0.20.9"

@Grapes(
  @Grab(group='org.reactivemongo', module='reactivemongo-core_2.12', version='0.20.9')
)

<dependency org="org.reactivemongo" name="reactivemongo-core_2.12" rev="0.20.9" />

[org.reactivemongo/reactivemongo-core_2.12 "0.20.9"]

'org.reactivemongo:reactivemongo-core_2.12:jar:0.20.9'