Is it possible using Localisation feature to create International Language Landing Pages only for the selected pages that I want to create for instead of creating it for the entire website?
There is no way to “restrict” which parts of the site are localized.
When you add a locale, every page will have a localized version, and you will navigate that language “layer” when you are switched to that locale.
If e.g. your site is primarily English, and you have a German alternate locale, that technically doesn’t mean that you have to translate every page, but it would be weird to have e.g. both /about and /de/about in the same language.