Luckily, there's enough TATA model still out there that you could probably google every one sold or listed online in recent years and find plenty of cowl plate pics to compare for ideas. I don't have on file or any extra info.
But if it's the sequence number then it appears to be at least a partial of another number listed on the buildsheet. My Formula only has 6 digits, others have 7, but the last 4 digits are listed below the VIN. Otherwise, I don't know what the rest stand for or how you'd find them. You'd have to check other TATA to see if they all have the X as well.