How to send V_VAR text from HA to MySensors node

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Hi!
I’ve made MySensors node for covers, but I want to send it through HA roll time, can someone show me, where can I find some text box or something similar?

else if(message.sensor == 21 && message.type == V_VAR1)
    {
        String strRollTime = message.getString();
        rollTime[0] = strRollTime.toFloat();
        saveState(20, rollTime[0]);
        Serial.println("change rolltime 0 to: " + String(rollTime[0]));
    }
    else if(message.sensor == 21 && message.type == V_VAR2)
    {
        String strRollTime = message.getString();
        rollTime[1] = strRollTime.toFloat();
        saveState(25, rollTime[1]);
        Serial.println("change rolltime 1 to: " + String(rollTime[1]));
    }