Field Font to be dynamic basis the field value length

Hi Team,

We have a CHK layout for a Bank where we need to populate the invoice Number of the Voucher on the Remittance of the CHK. Now the concern is that we need to print the Invoice number in a limited space and if the Invoice number length is more then 15 characters, it is resulting in line break which is causing alignment issue on the CHK layout.

What were are looking for is a possibility where the Font size of the Invoice number can be populated dynamically basis the length of the Invoice Number. I.e. if the Invoice length is more then 15 characters, the length should be 8. else it can be 10. We have tried the below logic but it isnt working. Any help would be greatly appreciated.