How to add property in existing node from spark connector

Neo4j Graph Platform
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df.select("GRID_ID","GRID_CENTROID_LON","GRID_CENTROID_LAT").distinct().write
      .format("org.neo4j.spark.DataSource")
      .mode(SaveMode.Append)
      .option("node.keys", "GRID_ID,GRID_CENTROID_LON,GRID_CENTROID_LAT")
      .option("labels", ":Grid")
      .option("url", url)
      .option("authentication.type", "basic")
      .option("authentication.basic.username", username)
      .option("authentication.basic.password", password)
      .save()

This is how I can create nodes with properties but the case is that I have already created nodes and now I want to add property or add another column as a property to that node.

This is exactly how i am creating nodes and relationships. How i can add property to the node postalCode

val relationshipConfig = Map(
        "CONNECTED" -> ("PostalCode", "Prefecture", "code", "Prefecture") // Corrected labels
      )

      // FUNCTION OF DATA INSERTION IN NEO4J
      def writeToNeo4j(
                        finalData: DataFrame,
                        relationship: String,
                        sourceColumn: String,
                        targetColumn: String,
                        sourceLabel: String,
                        targetLabel: String,
                        url: String,
                        username: String,
                        password: String
                      ): Unit = {
        try {
          println(s"Writing relationship: $relationship from $sourceLabel to $targetLabel") // Debugging

          data.select(sourceColumn, targetColumn).distinct().write
            .mode("Overwrite") // Use Overwrite mode carefully
            .format("org.neo4j.spark.DataSource")
            .option("relationship", relationship)
            .option("relationship.save.strategy", "keys")
            .option("relationship.source.node.keys", s"$sourceColumn") // Corrected: Just the column name
            .option("relationship.target.node.keys", s"$targetColumn") // Corrected: Just the column name

            // USE THIS TO PREVENT DUPLICATE RELATIONSHIPS (OPTIONAL FOR NOW)
            .option("relationship.merge", "true")

            // SOURCE NODE DETAILS
            .option("relationship.source.save.mode", "Overwrite") // Use Overwrite mode carefully
            .option("relationship.source.labels", s":$sourceLabel")
            .option("relationship.source.node.properties", s"$sourceColumn") // Corrected: Just the column name

            // TARGET NODE DETAILS
            .option("relationship.target.save.mode", "Overwrite") // Use Overwrite mode carefully
            .option("relationship.target.labels", s":$targetLabel")
            .option("relationship.target.node.properties", s"$targetColumn") // Corrected: Just the column name

            // NEO4J CONNECTION DETAILS
            .option("url", url)
            .option("authentication.type", "basic")
            .option("authentication.basic.username", username)
            .option("authentication.basic.password", password)
            .save()

Could anyone can help me?
thanks.