TRIMP and TSS are just different metrics. TRIMP doesn't use power. Still the same use case in the end, but differnt.
TSS is trade marked by Training Peaks and using it directly is prohibited.
TRIMP is the "Normal" standard.
For TSS/rTss you will need Power.
E.g. We use xPower to skip the usage of NP
More metrics are in an open ticket at our side, but no timeline.