Hi,
I am a seasoned Alexa developer.
I can help creating a skill like Macde Gayatri Mantra, it would mostly required the audio files to be hosted and available through https.
Using a Custom Skill, the Alexa Skill you imagine can be built.
One of the key component of the project is the hosting. I can assist in setting up the necessary through AWS or private hosting.
Please feel free to reach out on chat if you have questions or want more information.
Guy