Customize toolBar with variable tpsLiturgique from data class Chant - kotlin-android

Question

data class Chant(
val titreChant: String, val referencesChants: String, val tpsLiturgique: String, val refrain: String, val couplets: String
)
class listChants : AppCompatActivity() {
private lateinit var recyclerView: RecyclerView
private lateinit var chantList:ArrayList<Chant>
private lateinit var chantAdapter: ChantAdapter
private lateinit var toolBar: androidx.appcompat.widget.Toolbar;
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_list_chants)
recyclerView = findViewById(R.id.recyclerView)
recyclerView.setHasFixedSize(true)
recyclerView.layoutManager = LinearLayoutManager(this)
chantList = ArrayList()
chantList.add(Chant("KARIBUNI SISI WOTE", "Joseph Nkulu","Ordinaires","Karibuni sisi wote\n" +
"Tumsifu Mungu Mwenyezi Tumwimbie tumtukuze Kwa siku kuu ya leo!","1. Sauti zetu pokelea, wewe muumba vyote\n" +
"Tunavyo duniani.\n" +
"2. Angazia nyoyo zetu, tuwe na wazo kwako Wazo la kukuomba.\n" +
"3. Twapatana mbele yako, tusali kwa umoja Kama kabila moja.\n" +
"4. Tazamia kundi hili, twakusanyika leo Mbele yako mwenyezi!"))
chantList.add(Chant("KWANI BWANA NDIYE MWEMA","Joseph Nkulu","Ordinaires","Kwani Bwana ndiye mwema Huruma yake ni ya milele Na uwaminifu wake Vizazi kwa vizazi. Alleluia! Alleluia(bis)","1. Ingieni nyumbani mwake, kwa kumshukuru Katika pango lake kwa kumsifu, Litukuzeni, lisifuni, jina la Bwana. Alleluia!\n" +
"2. Msadikieni kwani ndiye Mungu aliyetuumba Sisi taifa lake, tupo kondoo zake Sisi taifa lake, twalishwa naye. Alleluia!\n" +
"3. Mshangilieni Bwana, enyi watu wote Msifuni kwa furaha, ingieni nyumbani mwake Katika nyimbo za shangwe, mshangilieni.Alleluia!"))
toolBar = findViewById(R.id.toolBar)
this.setSupportActionBar(toolBar)
this.supportActionBar!!.title = "Chants Ordinaires"
chantAdapter = ChantAdapter(chantList)
recyclerView.adapter = chantAdapter
}
linked toolBar title