I do not have recent experience of this so all I can do is quote from the Regulation.
From Commission Regulation (EU) No 1178/2011:
FLC.910.TRI TRI - Restricted Privileges
(a) [..]
(b) TRI for aeroplanes and for powered-lift aircraft — TRI(A) and TRI(PL). The privileges of a TRI are restricted to the type of aeroplane or powered-lift aircraft in which the training and the assessment of competence was taken. Unless otherwise determined by in the operational suitability data established in accordance with Part-21, the privileges of the TRI shall be extended to further types when the TRI has:
(1) completed within the 12 months preceding the application, at least 15 route sectors, including take-offs and landings on the applicable aircraft type, of which 7 sectors may be completed in an FFS;
(2) completed the technical training and flight instruction parts of the relevant TRI course;
(3) passed the relevant sections of the assessment of competence in accordance with FCL.935 in order to demonstrate to an FIE or a TRE qualified in accordance with Subpart K his/her ability to instruct a pilot to the level required for the issue of a type rating, including pre-flight, post-flight and theoretical knowledge instruction.
(c) [..]
It looks as though the application form to be used is the SRG 1133 and the examiner should complete the form SRG 2199.