Sorry for my bad English.
In AEC Remark 4.13.2, there is the following proposition
Let $K$ be a field, $E$ be an elliptic curve over $K$, and $G\subset E(\overline{K})$ be a finite subgroup. If $G$ is invariant by the action of $\operatorname{Gal}(\overline{K}/K)$, there is unique isogeny $\phi: E\to E'$ over $K$ s.t. $\operatorname{Ker}(\phi)=G$.
In the above, we denote $\operatorname{Ker}(\phi)$ as a kernel of $\phi_{\overline{K}}: E_{\overline{K}}\to E'_{\overline{K}}$.
Now I want to know that if we can generalize $G\subset E(\overline{K})$ for a finite subgroup scheme $G\subset E_{\overline{K}}$.
I can understand a basic algebraic geometry, scheme theory, finite group scheme theory.
Please tell me this theory, books, or articles.