User preference for selecting miles/km

Does anyone know if its possible to set an expression so a user can choose between miles and kM? Similar to 12/24 hr time.

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I don’t believe there is but if I’m wrong I’m very interested to know how.

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It can be selected on the screen in Km or Miles. Interactive layers are used for this purpose.

My sample work is shown in the picture.

Other shared my watch faces