split from beforeParse hook

nuxt.config.js

@@ -206,9 +206,20 @@ export default {
   hooks: {
     // Netlifycms cannot create array in json file at root level and nuxt-content need an array. So, ressources.json is parsed to fetch 'ressources' key.
     'content:file:beforeParse': (file) => {
-      if (file.extension !== '.json' || !/.*ressources.json$/.test(file.path))
-        return
-      file.data = JSON.stringify(JSON.parse(file.data).ressources)
+      if (file.extension === '.json' && !/.*ressources.json$/.test(file.path)) {
+        file.data = JSON.stringify(JSON.parse(file.data).ressources)
+      } else if (file.extension === '.md') {
+        if (/^---.*layout:.*---/s.test(file.data)) {
+          let t = 0
+          const data = file.data.replace(/---/g, (match) => {
+            ++t
+            if (t === 2) return '---\n<section>'
+            if (t > 2) return '</section>\n<section>'
+            return match
+          })
+          file.data = data + '\n</section>'
+        }
+      }
     },
     async 'content:file:beforeInsert'(document) {
       if (document.extension === '.md') {