Yes indeed it is possible.
Step 1: Create a parameter in the data tab and give it some name (for this case lets say you have two columns in your table name A and B where both are text and you want to have the search bar index on both of them).
Step 2: Create a new calculated column and name it something along the lines of rowShouldAppearInSearch. We want this to be a text column, 'true' if either A or B in the current row contains the current value of the parameter, false otherwise. To do this, have an if statement. If the length of the parameter is 0, return true (no parameter means we have no search restrictions). Else, if A contains parameter or B contains parameter, return true. Else, return false.
Step 3: Update your table to filter based on the calculated columns. So select the parameter to filter on, and then choose to filter to only include values of rowShouldAppearInSearch which are true.
Let me know if you get stuck on any of this. Otherwise, I hope I was able to help you out!
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