Crigg has given good tips

BUT

The rear-motor e-bike freewheels are a special case as the axle has a wider cross section than a standard wheel. Most freewheel tools cannot engage the splines as the centre bore is less than the axle diameter.

To perform this operation at the shop, I had to buy a Park FR 1.3 which is drilled with a 15mm bore.

https://www.parktool.com/en-us/product/freewheel-remover-fr-1-3?category=Cassette+%26+Freewheel

I do not know if there is currently an alternative product, I could not find another.

You cannot modify a freewheel tool with a 15mm drill bit typically, because the tool steel is so hard.

Crigg has given good tips

BUT

The rear-motor e-bike freewheels are often a special case as the axle has a wider cross section than a standard wheel. Most freewheel tools cannot engage the splines as the centre bore is less than the axle diameter.

To perform this operation at the shop, I had to buy a Park FR 1.3 which is drilled with a 15mm bore.

https://www.parktool.com/en-us/product/freewheel-remover-fr-1-3?category=Cassette+%26+Freewheel

I do not know if there is currently an alternative product, I could not find another.

You cannot modify a freewheel tool with a 15mm drill bit typically, because the tool steel is so hard.

Maybe this doesn't apply to you specifically but it will no doubt be useful for someone.