You can do/simulate it thanks to the sensor bypass feature. I do it manually in summer to be able to arm the alarm with second floor windows opened but you can also make automation for it.
Create an indoor group for all your indoor sensors then create automation that trigger at wanted time. Here is helpfull infos for configuring the bypass service call.
service: visonic.alarm_sensor_bypass
service_data:
bypass: 'True'
entity_id: YOUR_INDOOR_GROUP_ID
Create one more automation to remove bypass by setting it to ‘False’.
Notice that bypass status will be cleared after a panel disarm.