Hi @osx,
Do you want to display Rich Text value from a SP list within your app without using Rich Text Editor control?
I agree with @Anonymous's thought almost. As an alternative solution, I think the Html Text control could achieve your needs.
I have made a test on my side, please take a try with the following workaround:
On your side, you should remove the Original Rich Text Editor control from the corresponding Data card which related to the Multiple Line of Text in your SP list, then add a Html Text control within it, and bind it to the related field in your Edit form:
Set the HtmlText property of the Html text control to following:
Parent.Default
Set the Update property of the corresponding Data card which contains the Html text control to following:
HtmlText1.HtmlText
Best regards,