Here are a few ways to express this in Kannada:
1. Using "naanu kooda..." (I also...)
* "Nanu kooda ninna premavisuttide." (I also love you.)
* "Nanu kooda neevu heluttade pramavisuttide." (I also love what you are saying/feeling.)
2. Using "naanu helidare..." (I would say...)
* "Nanu helidare, naanu kooda ninna premavisuttide." (I would say, I also love you.)
* "Nanu helidare, naanu kooda neevu heluttade pramavisuttide." (I would say, I also love what you are saying/feeling.)
3. Using "aadu sadhya" (That's true)
* If someone says "I love you", you can respond with "Aadu sadhya, nanu kooda ninna premavisuttide." (That's true, I also love you.)
Important Note: Kannada emphasizes politeness and context. The specific phrasing should be adapted to your relationship with the person and the situation.