WalletConnect :- Rainbow always show MATIC when transfer other coins by WalletConnect sendTransaction in react native - web3js

Question

I am developing react native mobile application where user can transfer their amount by external wallet (Rainbow, MetaMask).
I am using 'polygon-rpc' network for my users.
The thing is working as expected but when execute transfer method by my contract by WalletConnect sendTransaction(txObj) library it navigate me to connected wallet and prompted the confirmation pop, where it show the my currency in MetaMask, but in Rainbow it always show Matic instead of POZ.
However it works well in Metamask and show the POZ, instead of MATIC.
I am using this code to procced transaction by WalletConnect external wallet
let toAddress = pozPouchFundWallet; // end address to transfer amount
let decimals = BigNumber(18);
let amount1 = new BigNumber(amountValue);
let value = amount1.times(new BigNumber(10).pow(decimals));
let contract = new Web3js.eth.Contract(App_ABI, POZ_TOKEN!);
try {
let dataa = await contract.methods
.transfer(toAddress, value.toString())
.encodeABI();
let txObj = {
// gas: Web3js.utils.toHex(100000),
data: Web3js.utils.toHex(dataa),
from: userWallet,
to: POZ_TOKEN, // Contractor token address
};
try {
const transactionHash = await connector
.sendTransaction(txObj)
.catch((_err: any) => {
Toast.show({
autoHide: true,
text1: t('topUpPoz.transactionFailed'),
type: 'error',
});
});
console.log('transactionHash is =', transactionHash);
resolve(transactionHash);
} catch (error) {
console.log('the connector error is = ', error);
reject(error);
}
} catch (err) {
console.log('contact error is = ', err);
reject(err);
}