There are some 5/4 styles, but essentially they are a bar of 3/4 followed by a bar of 2/4 (or vica-versa).

I understand that BiaB does not have any support for more than 4 beats to the bar.

Search for 5/4 in the StylePicker, but I think you will have to enter as two bars for every one 5/4 bar:

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