Jinja - Count Business Days

Hi, 
I am looking to capture the amount of business days between two dates fields in jinja. 
I am using this syntax for the count of days,

{{(a.authorization_end_date - a.$prev.authorization_end_date ).days}} 

however, I need this adjusted to business days. Is this a possibility?

Thank you, 
NT

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Nechama Turin
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