I FUCKING DID IT

Added a helper component for managing a list of strings.
This component could, in theory, also be turned into a generic one
for any type of data

frontend-reactive/app/components/util/string-array.hbs

@@ -0,0 +1,30 @@
+<div class="{{@wrapper-classes}}">
+  <ul>
+    {{#each this.args.list as |element index|}}
+      <li>
+        <div class="string-array-element-wrapper">
+          <Input
+            @type="text"
+            @value={{element.value}}
+          />
+          <div
+            class="{{@remove-element-classes}}"
+            type="button"
+            id="{{this.args.prefix}}-{{index}}"
+            {{on "click" this.removeElement}}
+          >
+            X
+          </div>
+        </div>
+      </li>
+    {{/each}}
+
+  </ul>
+  <div
+    class="{{@add-element-classes}}"
+    type="button"
+    {{on "click" this.addElement}}
+  >
+    Add element
+  </div>
+</div>