Well the strict answer is that you can't, cos a kit is already hopped so any hops you add are merging with that hop.
But if you dry hop in the FV you will get a good sense of what that hop is like. I would be inclined to also make a hop tea with some of the hops, as that will add more flavour than dry hopping. I wouldn't use all the 100g - but some people would, I would steep maybe 25g, and dry hop 25g. You can always increase it next time if you want more hop.
I think it would be even better to buy tins of malt extract instead of kits and boil it with water and hops. Kits are just malt extract with hop flavour. Light malt extract will make a very pale beer, amber malt extract contains some crystal malt and will give a traditional amber beer, dark malt extract will make a dark beer.
You can then do a boil and add the hops you want at various times. You can steep some grains too, which will improve the malt flavour and is an absolute doddle. It's mad not to, tbh, no-one regrets leaving kits behind, as good as some of them are nowadays. You gain control, and better beer.
Sierra Nevada Pale Ale is basically pale malt with a bit of crystal, which can be steeped, and cascade hops. And it's incredibly popular. And you can make it fresh in your kitchen very easily. A similar beer anyway, and fresher.