How to change the @timestamp from UTC to IST

[sandraimmaculate]

Hi, I'm getting email alert in timestamp of UTC i want to change it IST. I tired by going to advance setting and change the timezone to Asia/kolkata but

this was happen above it showing IST, the correct time. But in @timestamp field it showing UTC time
I tried the commands like sudo timedatectl set-timezone Asia/Kolkata even though i didn't get any changes.
So, if i do this advance setting > timezone to Asia/kolkata

Oct 30, 2023 @ 18:06:21 (its effecting here)
-- | -- | -- | -- | -- | -- | -- | --
TableJSONRule@timestamp2023-10-30T12:36:21.425Z_idoH-VgIsBV_26XOyiz-OP |   | @timestamp | 2023-10-30T12:36:21.425Z |   | _id | oH-VgIsBV_26XOyiz-OP
  | @timestamp | 2023-10-30T12:36:21.425Z ( its not effecting here )
  | _id | oH-VgIsBV_26XOyiz-OP

Because of this reason I'm receiving email alert in UTC timestamp.

Help me!!!!!!!!