Conditional formatting/formula highlight based on dates matching in row - Gantt chart

[Minilin]

Hiya,

I'm back again with another Gantt based query.

I would like to plot multiple holiday dates on the same row in a gantt chart against someone's name.

I thought there might be a way of doing this via conditional formatting but open to any possible formulas either.

Please see attached picture mock up of what I want to achieve.

Currently, I have to put these in one row at a time and, as you can imagine, that is making the chart massive and unusable.

Cheers