Integrating nested conditional logic in custom validation for side-by-side question type

Hello! We have a side-by-side question type which has a series of 12 rows and 3 column answers with dropdowns for each row, where the last 3 rows are Other/specify text entry. We would like to create some validation to do the following: 1. ensure that for Rows a-i (fixed response), a response is selected for each of the 3 columns 2. ensure that if there is a text entry in Rows j-l (Other/specify), then there is also a response selected for each of the columns 3. ensure that if there is a response selected in any of the 3 columns, then there is a written response provided in the corresponding Other/specify row ! We would like to use nested conditional logic but the Custom Validation feature for side-by-side question types does not allow for nested conditional logic. Do any in the community know if there is a workaround or integration that can be used to achieve the same effect? Have others in the community been successful using Javascript to achieve a similar result? Many thanks in advance for any tips, code snips, etc.!