I can't find how to reproduce the bevel property of usual text object in Geometry Nodes (Blender 3.1).
What I tried is this, but I can't find how to add bevel:
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Well, I had this node setup to get some bevel... you could place it in a group and reuse. It's simple but far from perfect, works by extruding a couple of times and fattening some faces. It can add deformation too, so be careful.
In the blend you can see how to smooth it with an extra Split Edges modifier, but you need to realize instances first to use the modifier stack. May be done with selections inside geometry nodes I guess.
And I bet there are some other setups on this...