Can I place “parent theme” inside a child theme folder?

This is New Idea, but till now there is no way we can install parent theme inside child theme, but according to your requirement we can hide the theme from the list of available themes.

this approach is not global but your project-specific
you can identify your theme name which you want to hide.
and then using CSS you can hide it

for example: here I attached 2 pic

available themes

in this i have prent theme Divi which i hide it using css data selector

[data-slug="Divi"] {     display: none; }

hide parent theme

As I am not front-end developer, hiding like this cause design issue so you can improve this.
Thank you

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