How can I display the run count as part of the `watch` output in a terminal?

I'd like to see a run counter at the top of my watch output.

Ex: this command should print a count value which increments every 2 seconds, in addition to the output of my main command, which, in this case is just echo "hello" for the purposes of this demonstration:

export COUNT=0 && watch -n 2 'export COUNT=$((COUNT+1)); echo "Count = $COUNT" \
&& echo "hello"'

But, all it outputs is this, with the count always being 1 and never changing:

Count = 1

How can I get this Count variable to increment every 2 seconds when watch runs the command?

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