Additional dayrules / handle 0.5 day holiday rule

Hi @all

is it possible to manually create day rules for the holiday management in dolibarr?
In Germany there’s a separate rule for December 24th and December 31st.
On these days only 0.5 days should be reduced from the employees free days.
By now 1 day is deducted as normal.

Or what other option is there to achieve this result?

Best regards
Bastian