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You can't do this purely in LrMobile. Instead you'd need to create virtual copies in LrDesktop.
I was afraid that was the only answer. I feel like Lightroom Mobile really needs this functionality as it is one of Lightrooms chief 'exploratory devices' when deciding if you have what you need in your image and in creatively deciding which way to go with a final 'print'.
Plus some photos work well in both B&W and color and you may want both, say for posting on various websites.
I hope they add this functionality soon as it often limits my enjoyment in the processing process. I.e all of these images were edited in Lightroom mobile https://instagram.com/Brettmcee
thanks for your reply!
That sounds like an awesome feature request. You can post your feature requests here: https://feedback.photoshop.com/photoshop_family/categories/photoshop_family_lightroom_mobi le
Users like you can up-vote your suggestion and that site is generally where our engineers lurk for bugs and feature suggestions.