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This is not possible using Change Data Value.
The only way, in Marketo, to transfer values from a field on a Custom Object record to a custom field on the Lead is by using some very deep and undocumented Velocity code (which good taste prevents me from sharing in public).
You may want to rethink using COs -- maybe go with a JSON field on the lead instead. Data on those fields can directly interact with other lead fields via webhook.
Ahh I see, that is understandable, also a JSON field on the lead would make sense, if I can access it and allow me to interact with my webhook that would be perfect, thank you!