Grid cell combo select box with subscript/superscript formatting

I have a grid where one cell needs to be presented with subscript and superscript formatting.

The cell type is coro with the additional select/options definition:

cbbEquationType = oGrd.getCombo(cInd_EquationType);
cbbEquationType.put("1","a*(x<sub>1</sub>)<sup>2</sup>+b*(x<sub>1</sub>)+c");
cbbEquationType.put("2","a*x<sub>1</sub>*x<sub>2</sub>");

When not editing, the cell displays as expected. However, when editing, the select options are raw text (i.e. not HTML-formatted):
combo

Is there a way to display the select options with HTML formatting applied?

co/coro select editors are based on the html select and are not able to display the html-content.
In this case I can suggest you to use the “combo” column type instead:
https://docs.dhtmlx.com/grid__combo_integration.html