This is the main problem we are facing right now.

We are looking for tools that can generate fake data(may be based on our small set of data) for live demo setup.

You could try using something like Synth[0]! You can hook it up to a database, it'll generate some json describing the shape and types of your data based on your database (or you could write the json yourself), then you can use Synth to generate fake data and directly insert it into your database.

Full disclosure, I'm the maintainer, but it's not like it'll cost you anything.

[0] https://www.getsynth.com

Faker.js works pretty great. You can also just set up the fake data yourself in the database.