How can I get dynamic references with $index to work in dmx-html?

I have ten fields in a database 'add_costs_1', 'add_costs_2', 'add_costs_3' to 'add_costs_10'

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I am using them in a repeat and so want to reference them dynamically

If I reference them manually ie with '.add_costs_1' at the end, like this

dmx-html="$index == 0 ? '<i class=\'fa-ban fas\'></i>' : sc_ad_add_costs_mq.data.qp_ad_add_costs_mq[add_costs_id-1].add_costs_1"

then the results are as expected (but only reference the first field repeatedly, many times).

If I try to reference them dynamically then I cannot get a result. So I have tried things like

dmx-html="$index == 0 ? '<i class=\'fa-ban fas\'></i>' : add_costs_$index"
dmx-html="$index == 0 ? '<i class=\'fa-ban fas\'></i>' : add_costs_{{$index}}"
dmx-html="$index == 0 ? '<i class=\'fa-ban fas\'></i>' : add_costs_[$index]"
dmx-html="$index == 0 ? '<i class=\'fa-ban fas\'></i>' : 'add_costs_' + $index"

but nothing I do seems to work in the 'dmx-html'.

I know I don’t need to put

dmx-html="$index == 0 ? '<i class=\'fa-ban fas\'></i>' : sc_ad_add_costs_mq.data.qp_ad_add_costs_mq[add_costs_id-1].add_costs_1"

and I can just use

dmx-html="$index == 0 ? '<i class=\'fa-ban fas\'></i>' : add_costs_1"

But I’m still stuck on how to make that last digit dynamic.