The easiest way to do that is to create a second variable which is formatted and save that one instead of the original. For you case you would use the join function to convert the list into a nicely formatted string.
{note}
{formattedpropertystrategy=join(propertystrategy, "BLAZE_AND")}
Formatted Property Strategy: {=formattedpropertystrategy}
You would save this second variable to Data Blaze instead of the original.
{endnote}
Alternatively, may want to use a Multiple Select field type in Data Blaze for this type of Data. That would display your data as separate chips in Data Blaze:
If you used that field type, you wouldn't change how you were saving the values as the Multiple Select field type needs values in the original format.