qml: show backup type, as in qt

electrum/gui/qml/components/ChannelDetails.qml

@@ -97,6 +97,21 @@ Pane {
                         text: channeldetails.channelType
                     }
 
+                    Label {
+                        visible: channeldetails.isBackup
+                        text: qsTr('Backup type')
+                        color: Material.accentColor
+                    }
+
+                    Label {
+                        visible: channeldetails.isBackup
+                        text: channeldetails.backupType == 'imported'
+                                  ? qsTr('imported')
+                                  : channeldetails.backupType == 'on-chain'
+                                      ? qsTr('on-chain')
+                                      : '?'
+                    }
+
                     Label {
                         text: qsTr('Remote node ID')
                         Layout.columnSpan: 2

electrum/gui/qml/qechanneldetails.py

@@ -190,6 +190,12 @@ class QEChannelDetails(AuthMixin, QObject, QtEventListener):
     def isBackup(self):
         return self._channel.is_backup()
 
+    @pyqtProperty(str, notify=channelChanged)
+    def backupType(self):
+        if not self.isBackup:
+            return ''
+        return 'imported' if self._channel.is_imported else 'on-chain'
+
     @pyqtProperty(int, notify=channelChanged)
     def toSelfDelay(self):
         return self._channel.config[REMOTE].to_self_delay