Thank you for this, @IsmaelChivite, what a clever way to do it! Following your instructions, I added a single text field, called parkdetails, hid it and set it to not submit an answer. Below is the URL I was then able to use, included an image to show the results. I'm generating the link in a web map, so it can also plug in attribute field values so the details will be custom to the park building the person opens the rental form for.
https://survey123.arcgis.com/share/<surveyID>?field:parkdetails=<div style="font-size:1.25em;font-style:italic">Please review your rental details</div><br/>Capacity: {CapacityField} guests<br/>Resident | Non-resident fee: ${ResFeeField} | ${NonResFeeField}
Thank you again so much, this is EXACTLY what I needed!