when there is already a modpack sometimes there are mods that would make the modpack better for certain devices like adding fps mods to it.. to do this you have to trasport the file and add it to a new modpack but if you could add mods to already existing modpacks it would make that system easier. but it should be only the one you download so it doesnt change the original modpack like a duplicate but it wont be public just for yourself so others cant just copy others modpacks.
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It seems you are not aware it already is possible.
In any modpack you downloaded click on the three vertical dots and then "Profile Options".
Then click on the gray case as showed in the picture attached.