Hi @Irakli Injgia ,
Do you want to change drop down menu color? You could accomplish this with jQuery or SharePoint Designer.
More detail for reference: How i can change the color font to red in a drop down feild inside sharepoint
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And you could create a calculated column as a workaround.
1.Create calculated column:
List Settings > Columns > Create column > Calculated column
2.Add following codes to Formula:
176158-code.txt
Note: Please replace [Column 1] by [your choice column name].

3.My test result:

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