You can't.
The only way you could do it would be if Jet2.com were to pay it for you, and give you a reduced salary (ie deduct an amount for the TR) pre tax, hence you would not pay tax on it.
That is how it used to work, 3 years ago.
I'm afraid in your case you cannot claim any of the VAT back, and of course need to earn a lot more than the TR to cover the cost, once you have paid your NI and tax. You are an employee, not a contractor as in most of the RYR cases.
DW.