How to use the aioboto3.Session function in aioboto3

async def aio_sts_assume_role(src_role_arn, dest_role_arn, dest_external_id=None):
    session_name = ''.join(random.choice('0123456789ABCDEF') for i in range(16))
    async with aioboto3.client('sts') as sts:
        src_role = await sts.assume_role(
            RoleArn=src_role_arn, RoleSessionName=session_name
        )
        async with aioboto3.Session(
            aws_access_key_id=src_role['Credentials']['AccessKeyId'],
            aws_secret_access_key=src_role['Credentials']['SecretAccessKey'],
            aws_session_token=src_role['Credentials']['SessionToken'],
        ).client('sts') as sts_client:
            sts_role = await (
                sts_client.assume_role(
                    RoleArn=dest_role_arn,
                    RoleSessionName=session_name,
                    ExternalId=dest_external_id,
                )
                if dest_external_id
                else sts_client.assume_role(
                    RoleArn=dest_role_arn, RoleSessionName=session_name
                )
            )

aws_secret_access_key=src_role['Credentials']['SecretAccessKey'],
            aws_session_token=src_role['Credentials']['SessionToken'],
        ).client('sts') as sts_client:
            sts_role = await (
                sts_client.assume_role(
                    RoleArn=dest_role_arn,
                    RoleSessionName=session_name,
                    ExternalId=dest_external_id,
                )
                if dest_external_id
                else sts_client.assume_role(
                    RoleArn=dest_role_arn, RoleSessionName=session_name
                )
            )

            return aioboto3.Session(
                aws_access_key_id=sts_role['Credentials']['AccessKeyId'],
                aws_secret_access_key=sts_role['Credentials']['SecretAccessKey'],
                aws_session_token=sts_role['Credentials']['SessionToken'],
            )