1.
Create a timer with action countdown
/timer create reload 30s stop countdown
2.
Now we need to add some messages
/timer cmd reload addMessage 30s &aReload in &c30&7Seconds&8.
/timer cmd reload addMessage 15s &aReload in &c15&7Seconds&8.
/timer cmd reload addMessage 10s &aReload in &c10&7Seconds&8.
/timer cmd reload addMessage 5s &aReload in &c5&7Seconds&8.
/timer cmd reload addMessage 4s &aReload in &c4&7Seconds&8.
/timer cmd reload addMessage 3s &aReload in &c3&7Seconds&8.
/timer cmd reload addMessage 2s &aReload in &c2&7Seconds&8.
/timer cmd reload addMessage 1s &aReload in &c1&7Second&8.
/timer cmd reload addMessage 0 &cReloading&8.
3.
Now we add the reload command on the last tick
/timer cmd reload addCommand 0 reload
4.
Finish
Now we can enable and check if it works with
/timer set reload enable
or
/timer list(click on enable)
Gif