Accepted answer

If you want to have point with 0/origin in different position that rest of series - then instead you should use different series and add hidden another horizontal axis (in your code it will be y-axis because of invert caused by bar charts). To synchronize those axes you can set proper max and min on axes. Example:

OR You can use threshold Example:

You have also posted image with series on between of ticks. You can set x position of point to not round values like 1.5. Example:

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