Is there any way to kill Sakura/Tsunade?

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No you are wrong

Byakugou: Sozo Seisei still used chakra to heal, nothing in NV not using chakra.

I worded that wrong . I know chakra is being used i meant they don't control it by themselves while byakugou is on
The body does it by itself.

Amaterasu was not normal fire, it burned 7 days 7 nights if Im remember .

It can eat normal fire, its not normal fire to begin with.

If Amaterasu burn whole body rapidly, no way healing can counter it, the fire will ate flash and cell continuesly and rapidly and make healing difficult. And in turned it will weaken Sakura and Tsunade body.

I know it was just an example. Healing cant but regeneration can

We have seen how Amaterasu despair . If the cells were replaced with new ones then the amaterasu would despair.(unless the ametrasu user continue shooting it)

In fiction all rapid healer never heal when attack still active but after that, after their body is completely burned or damages exp) JJ Madara, Cell, Majin Buu, Alucard etc.

the reason sakura and tsunade could stand up and fight while susano sword/the black rods (isn't the black rod a special rod that can not even be touched?) are inside them is because the byakugo is constantly healing them . Sure The wound would only despair if the object is removed tho.