Vector Algebra: JEE Main 2021 Mathematics question

Let three vectors $\overrightarrow a ,\overrightarrow b$ and $\overrightarrow c$ be such that $\overrightarrow c$ is coplanar with $\overrightarrow a$ and $\overrightarrow b$, $\overrightarrow a .\overrightarrow c$ = 7 and $\overrightarrow b$ is perpendicular to $\overrightarrow c$, where $\overrightarrow a = - \widehat i + \widehat j + \widehat k$ and $\overrightarrow b = 2\widehat i + \widehat k$ , then the value of $2{\left| {\overrightarrow a + \overrightarrow b + \overrightarrow c } \right|^2}$ is _____.