Hi @Anonymous ,
I think that your topic is more related to PowerAutomate Community, but here is my answer:
I understand that you want to convert the values of a specific column to String and insert this string in the body of an email.

Please follow my flow:
First of all, I initialized a variable (yourText) to keep the temporary string
Then I took 5 items from a random lists of mine.
After that, I iterate through getting the value of the column desired and append it to the the temporary string.
At the end, only for testing propose, I initialized another string variable with the current temporary string value.
Hope it can help you !