Yes you read that right, you can easily write in Hindi using IBus in Linux. Select itrans transliteration method for the Devanagari writing system. Open your favorite editor and you can now type in Hindi. I am giving the keymap for the letters all you had to do is combine them.
Vowels
Consonants
Ligatures
References:
1. https://www.aczoom.com/itrans/html/dvng/dvng.html