Study of the charged super-Chandrasekhar limiting mass white dwarfs in the <math display='"inline"'> <mrow> <mi>f</mi> <mo stretchy='"false"'>(</mo> <mi>R</mi> <mo>,</mo> <mi mathvariant='"script"'>T</mi> <mo stretchy='"false"'>)</mo> </mrow> </math> gravity