Sure. In my case, it’s a Shearwater Perdix AI. But there are many others that enable gas switching as well. My previous computer was an Oceanic, and many in the Oceanic line allows this as well. I think you’ll find that many computers offer this capability. The real question is how does the UI enable this. Some are much easier than others. From ease of use the Shearwater UI is worth looking into it, and all their line, even the rec oriented Peregrine offer gas switching.
In the case of the Peregrine, you are limited to 3 different gasses. The Perdix allows up to 5 gases.
Edit. Oh, one more thing. You can absolutely use this function to switch to a higher O2 gas for ascent or deco. Key thing is that the different gasses should be turned off unless they go on the dive with you, to avoid selecting the wrong one. If I only take one gas with me, I leave in simple Nitrox mode which only allows one gas. If I take a pony with me, I’ll turn that one on as well, though likely never switch to it.