Definitively an indicator. The offline chart.has no use here. It might not be so complicated, all you needed would be a custom candle construction (like the HA indicator), and a logarithmic axis rendered on a (right hand) side.
Have you tested it on Excel or Matlab first? Here is another tool (free and premium) https://www.incrediblecharts.com/help/log_normal.php
How long do you hold your positions, if I may ask?

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Hi,
I want to see the dow jones in an logarithmic chart in the metatrader.
I know, there is no simple solution for that.
But how can I program this point?