Yes, there is. If you scroll up or down slightly you'll see the scroll bar on the right. Double tap that and then hold/press the scroll bar and you should have the ability to fast scroll up and down on the conversation.
I have an iPhone 11. What iPhone are you using? It might be slightly different between phone versions.
OK so it [i]should[/i] be similar. Is there anything else on your mind about this situation?
Thank you and have a good one!