Is there in vscode a shortcut available which selects all code between matching brackets e.g. in atom this shotcut is ctrl+alt+m
Place the cursor inside the bracket (not directly next to a bracket) and execute editor.action.smartSelect.grow until everything inside the bracket is selected. The default shortcut is Shift+Alt+Right.
You can shrink the selection with editor.action.smartSelect.shrink which has the default shortcut Shift+Alt+Left.