Skimmia Finchy - chalky soil?

I have a couple of container growing skimmia that are outgrowing their pots. Tipping them out today, they seem to be pretty root bound. I’d rather replant them directly into the border  but although I have pretty decent top soil, we are in a chalky area. If I put them in with a lot of compost, will they be ok? The advice online is so mixed. Some say acidic, some neutral and some say chalky is fine, so I’m feeling pretty confused!

Many thanks.