With @Diksha's help, I have generated a correct-looking reference to a variable using the following formula:
concat('variables(','''','strHTMLChartSect',string(variables('intSectNum')),'''',')')

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When I try to use the outputs as an inputs to access the value of the variable, it adds the text for the variable, but not the value of the variable:

My Question
How do I get Flow to return the value of the variable and not just the text reference to the variable?
Thank you for your assistance with this; it is much appreciated.
@Hardesh15 was helping me with something similar earlier, and got close, but we never quite got to a solution.
If it helps, here is the Peek Code: