SN74LVC8T245: About Input transition rise or fail rate

Part Number: SN74LVC8T245

Tool/software:

We are utilizing the specified buffer, but we are operating at the edge of the specifications regarding the input transition rise or fail rate

We are operating at a power supply voltage of 4.2V, but how should we consider the specifications for the input transition rise or fail rate at this point?

We have confirmed that it is capable of 10ns/div or more, but we would like to know the specific numbers that can be guaranteed by the Texas Instruments
We have a worst-case specification of approximately 7.4 ns/V, so we would appreciate it if you could guarantee 7.5 ns/V