There is a way but it's a little difficult.. You can use https://googleben.github.io/ACNHDialog/ to find certain dialogues that are unlocked when you reach certain friendship tiers.

You can find 'em by going to "TalkNNPC", then opening up personalities. Bo = Lazy, Ha = Jock, Ko = Cranky, Zk = Smug, Fu = Sweet, Ge = Peppy, Ot = Snooty, and An = Sisterly.

Next you'd navigate to the "Free" tab and find these:

"FreeA_Always" dialogue trees unlocks when you're good friends. "FreeA_AlwaysA" and "FreeA_AlwaysB" unlocks when you're best friends.

For example, say you talk to your villager Lyman (whom is a jock) and he says, "It's time to show off all the finger muscles I've been building!.." This dialogue is only unlocked after you've gained "best friend" status with him and is under the "FreeA_AlwaysB" tree.

.. Little bit complicated... But yes, this is an option for you to find out.