Well, it's not going to be internalized by the companies, no matter what happens. It's going to be borne by consumers, either in taxes or in direct charges.
The difference is, if it's direct charges, then people feel more pressure to limit how much they use.
Either remove subsidies from Oil and Gas or subsidize EV purchase and charging. The argument of total cost is flawed otherwise.
To your actual point, I have an honest question: Is electricity subsidized? Do you have a figure for total subsidies, worldwide?
Note that much of the investment in renewables has been subsidized, though that's probably a one-off at installation rather than an annual amount. It would have to be pro-rated over the expected lifetime of the installation.
There also countries where national grid and generation are state owned and there again a second tier of government financing exists.
This means that every year the world's taxpayers are giving 7% of the world's GDP for free to Oil and Gas industry.
Before any comparison can be made, the real cost of oil and gas needs to be internalized by these companies .
[0] https://en.m.wikipedia.org/wiki/Fossil_fuel_subsidies