Hi @hss0827
Has your problem been solved?
Do you want to filter out items that meet certain condition from sharepoint list? Could you please share a bit more about your scenario?
I set up a simple flow, you can refer to below screenshots to see if it helps.
This is my test list, I will filter out items that Date is less or equal to current UTC time plus 'EmailAlertDays‘ days.


Expression:
addDays(utcNow(),int(item()?['EmailAlertDays']),'yyyy-MM-dd')

If you problem has been solved by Ramspevi , please accept Ramspevi's answer as Solution.
Best Regards.