How can I ground this charger
You need an international travel adaptor, from the European plug type, specifically plug types E &amp; F, to an Indian plug, type D.

See WorldStandards - Plug &amp; socket types for further information.

If you are a competent electrician, you could snip off the existing 'foreign' plug &amp; change it for a domestic… I would weigh that against not recognising the plug type &amp; solution &amp; say "Don't do that yourself!"

You can get travel adaptors in any airport &amp; usually at stores that cater to travellers, e.g. luggage stores, or generally in tourist areas.

Note: Apple power supplies are multi-voltage, so you don't need to make any allowances for a potential supply difference between the two. [India &amp; the EU are both 240v anyway, but just for sake of completeness.]