In patch 1.6 the developers secretly added two-digit numbers to customization. However, the feature itself is hidden and is also missing in the full patch note description. There are 2 fonts to choose from:
• Two-digit number “Two-digit black”
• Two-digit number “Two-digit handwritten”
There are also blocked (as was the case with three-digit numbers) combinations of numbers: 00 14 18 28 64 88 0