How to add prefix or suffix to only One metric in a 2 metric bar chart

Question

I have a bar chart with 2 metrics (no: of Applications & sum of amount) and one X axis.I want to add a prefix as INR to only 1 metric (sum of Amount). The current version am using is V3.1.0 which has a bar chart customisation to prefix or suffix, however it applies on both the metrics.

I dont see a way to acheive the above requirement, please any help?

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The current version am using is V3.1.0 which has a bar chart customisation to prefix or suffix, however it applies on both the metrics.