These useful ArcGIS Arcade expressions are for appending values to simulate comma separated Survey123 entries. These particular expressions include an SQL statement to select from a free-text comment that needs to be converted to the Survey123-like select_multiple format.
The data includes roughly 600 entries prior to the addition of a select_multiple that aims to simplify data entry. While that change has been a dashing success, prior entries do not include the normalized data. These edits look for keywords in the comments and convert them to comma separated values.