title: Converting json map to csv using jq
body: <p>input</p>
  
  <pre><code>{"key1": ["value1", "value2"], "key2": ["value3"]}
  </code></pre>
  
  <p>Desired output</p>
  
  <pre><code>key1, value1
  key1, value2
  key2, value3
  </code></pre>
  
  <p>Having a hard time figuring out jq command to achieve this... I have tried map, as, to_entries filters in various combinations but no luck.</p>