How to get unique values from loop function for watcher subject

I have used {{#ctx.payload.hits.hits}} {{}} {{/ctx.payload.hits.hits}} function in the subject of the watcher. Its printing all values with duplicates, can someone please help me how to get Unique values from result set of above.

{{#ctx.payload.hits.hits}} {{}} {{/ctx.payload.hits.hits}} returning like below
{0:alpha} {0:alpha} {0:beta} {0:alpha}

I need only {0:alpha} {0:beta} vlaues

Thank you in advance

Please can someone give me some idea, how to proceed further.

Thank you!

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