How to add captcha to telegram bot in java?

Question

Java

Welcome all! Please tell me how to add a bot to the captcha in the telegram. Are there any ready made solutions? I asked in Google, I did not find analogues. Captcha is interested in 4-6 numbers on a white background. Or do you need to add pictures with numbers to the database yourself? to add the corresponding values ​​of ints to them and check the user's input with these values?