You can achieve this in two ways: 1. Direct method: Simply copy and paste the desired constant value into each cell of that column.
2. Formula method: Create a formula column that always returns the same value. You can set this up as a conditional run where the formula will automatically populate the same value for new rows.With auto-update enabled, the formula method will ensure new rows automatically get populated with your constant value when they're added to the table.
Source:Apify integration overview | Documentation | Clay University