why didn't use が instead of には in [そんなこと、私にはとても出来ない。]?

Is it correct to use が? What is the meaning/sense and role of には in the sentence to choose it over the 'ga' particle? English: [There's no way I could do something like that.]

Note!! Same phenomenon in [この本の漢字は難しいので私にはとても読めない。].

Why wasn't が used instead of には in

[そんなこと、私にはとても出来ない。]?

Is it correct to use が? What is the meaning/sense and role of には in the sentence to choose it over the が particle?

English:

There's no way I could do something like that.

Note!! Same phenomenon in [この本の漢字は難しいので私にはとても読めない。].