total_points: total number of potential mid-roll points
matched_points: number of mid-roll points that have already matched the expression
total_duration: total duration of the content, in seconds
total_progress: normalized position from 0 to 1
last_mid_filler: seconds since last mid-roll filler
remaining_duration: duration of the content after this mid-roll point, in seconds
point: the position of the mid-roll point, in seconds
num: the mid-roll point number, starting with 1