TTL Gates Power Dissipation Values
I am not finding any datasheets that provide clear information about the power dissipation

Because total power dissipation depends on the outputs.
For example, this is from 74LS08:

Total power dissipation is the product of supply current and supply voltage:
$$
P_T=I_{CC} \ V_{CC}
$$
Note that all the logic gate datasheets provide supply current information.