Time Remapping is a bit of an oddity. If you have no Time Remapping keyframes, you don't have access to the property. (I assume it's still accessible through a scripting interface, but that's probably beyond the scope of what you're asking.)
For what it's worth, it's [otherwise] totally possible to save an expression-only preset, though that creates kind of a catch-22 here.
Could you... create the preset using the 0 frame keyframe + expression?
This depends on your expression. You can set one keyframe for time remapping at the head of the layer then use the expression to control time. Show us the expression and a complete explanation of what you are trying to accomplish and maybe we can help.
Hi Colton Media Productions,
Are you still facing this problem? If not, let us know how you solved it. If so, please let us know so we can assist you further.